I read it earlier. It was long, but didn't touch on the PS2's actual sales progression much. The PS4 is showing a clear decline from year 5 to 6 while the PS2 had had a stronger hold.
The sole premise for the PS4 to have any shot at matching the PS2 is a completely unrealistic sales curve of consistent 20% year over year declines until the end of its life. Consistent 30% year over year declines are unrealistic too, but if that actually happened, the PS4 would finish under 140m. It was a rather weak analysis for a question where the answer is a clear "no." It should have included more sales data for the PS2 while at the same time explaining all the factors why the PS2 had a long tail.