Crazy that a newer game is already 'free.' Did it not sell as expected? It was on sale a few months back. Crazy how quickly ps4 games drop in price. I rarely pay full price, given they don't hold their value.
Them read his post, he is asking if it did not sell well enough and said it got a deal few months after release.
I did read his post. As I bolded above, he asked if it sold "as well as expected". This is not implying the game sold bad, rather that SE expected more from a game tied to such a legacy title. He also stated that the game was on sale a few months back, during the holiday.
So it sounds to me that he is wondering if it is much higher than the 5 mil we saw back in aug despite all that, which would indeed be lower than SE likely projected. Not selling as well as expected =/= selling bad.
As for why it is on PS+, it should be obvious. Most people who wanted to buy it already did (be it at full price or on sale). So in order to promote part 2, they are trying to get part 1 in the hands of as many gamers as possible.