You were right about the FY year thing, I got confused because one of the reports started with last year's FY results. I can't find the document I was looking at before, but the one you're citing for the PS3 decrease makes no mention of the PS2 at all (probably since the system had been discontinued by March 2013). I know Sony's full FY report says 16.5 mil for PS3 + PS2, but there's nothing anywhere to suggest how much of that is made up by the PS2, it's a pretty huge stretch to assume it was flat or increased because it wasn't mentioned.

It's not just a guess, since Sony hasn't commented on the PS2, unlike the (PS3, PSP and PSV), even though it's counted in the 16.5 million sales figure. To me, it seems logical and coherent to say that it's been at least stable throughout this fiscal year, because if it wasn't the case Sony would have mentioned its decline, just like the others platform.

If you want to know everything, I invite you to read ZhugeEx's comments on resetera to understand where the 159.2 number comes from and why everything below this figure is wrong. 

https://www.resetera.com/threads/what-was-the-lifetime-sales-of-the-ps2-not-158m-update-between-159-2m-and-161-9m.77277/page-2

For me, this makes much more sense than the other figures, which make little sense and are based on nothing at all.

For example, for the fiscal year 2011, when sales of the PS2 dropped from 6.4 million (2010) to 4.1 million (2011), they highlighted the decline in their report.

it's the same for the other years in which it was in decline 2010, 2009, 2008, 2007 and 2006, each sales decline was mentioned at the end of the fiscal year in the reports.

Whereas for fiscal year 2012 there is no mention of a drop for the PS2 sales unlike others years.

You're ignoring the fact that the PS2 got discontinued during FY2012 (right around the end of 2012), which a) makes it not so strange for them to not mention it, especially since the report has no mention of the PS2 anywhere, not just in this section about sales decreases and b) makes it extremely unlikely they would ship more PS2s that year than the previous one with the system only being in production for 3 quarters and production likely winding down before that. You're essentially suggesting that they decided to speed up production in 2012 and then stopped all together shortly after that.

They may well have sold 4.1 million that year (FY 2012) or even more, which means that their sales have remained at least stable, and the fact that they're not talking about any drop in sales is already a much better indicator than the ending production in January 2013, which means nothing at all.

In addition, as ZhugeEx points out, you only need to use the 80 million PS3's as of November 2, 2013 to know that the PS3 couldn't have made more than 12.4 million in that same fiscal year.

And officially we know that it was at 64 million on March 31, 2012

They miss us its sales between April 1, 2012 and March 31, 2013

officially
Q1 April - June 2013
1.1 million

Q2 July - September 2013
2.0 million

Q3 October - December 2013
3.3 million

October 2013 it sold at
55K (NPD in US)
57K (MediaCreate in Japan)

We can say that during this month of October it sold in the best case 500~600K worldwide (with 400~500k for the rest of the world), knowing that it sold much better during November (415k NPD / 61K MC) and December (299k NPD / 103 MC) it's logic for the 2 months of the end of the year on the 2 most important markets.

As of November 2, 2013 Sony announces PS3 has surpassed 80 million worldwide.

So :

80 - 0.5 (October) - 2.0 (Q2) - 1.1 (Q1) = 76.4 million as of March 31, 2013

76.4 - 64 = 12.4 (between April 2012 and March 2013)

Which leaves us at least 4.1 million for the PS2 for the same periode

4.1 + 12.4 = 16.5 million (PS2 + PS3).

Oh yeah! Well… Sega passed 60 million!

I think….

It would have been better for the DVD market and the idea of physical media. Blu Ray was rolled out far too early and artificial. The way they tried to make everyone think they needed it was absurd. In 2010 it would have made much more sense. A better price wouldn’t have impacted Nintendo’s strategy, but it definitely would have helped the Sony image that gen and taken more sales away from Microsoft. 

It's hard to track down the original source for most of these numbers except the 80 mil announcement. I believe the 63.9-64m is not an official figure but accumulated from quarterly reports so it could very well be off due to rounding, by how much is anyone's guess. But regardless it remains extremely dubious to me that shipments would increase in that final FY. I don't buy > 4.1 mil, but close to it maybe.

https://gamingbolt.com/sony-fy12-report-ps3-sells-63-9-million-units-sales-down-across-the-board

https://www.eurogamer.net/a-dip-in-playstation-sales-but-also-a-dip-in-sonys-losses

"PS3 lifetime sales have been impossible to specifically calculate since Sony started lumping PS3 and PS2 sales together in April. As of March 2012 the specific global total was 63.9 million".