Do anyone ever ask him about the Cesc false 9 issue in pressers?
There is no "Cesc false 9 issue". It's just a handful of fans wasting their spare time repeating the same thing over and over, pretending to be better coaches than someone who is involved in football at the highest level for 30+ years.
Not playing Neymar in the middle is football 101. Players like Neymar get crowded out by default. He runs well with the ball at his feet, he passes well and is a goal threat => opponents want him marked tightly. Put him in the middle and they will ignore Pedro and Alexis on the wings and concentrate on defending the main threat in the middle and put 3 or 4 bodies tightly around Neymar. On the wing there is more space to work with for Neymar to pull Villarreal's shape apart and create space for his teammates in the middle.
Barca is suffering from this with Messi for quite some time now. With Messi it's even more extreme but Messi is simply good enough to make it work despite heavy marking against pretty much everyone except the very elite teams. Against those teams however even he needs a striker infront of him (AC Milan last season) or to play on the wing (Clasico this season) these days.
Working the wings against a side that is clogging the middle is football 101. You don't want to intensify the clogging effect by putting Neymar centrally.
The irony in all this is that the winning goal came from Cesc playing a pass from midfield and Neymar scoring from the center of the box. The players aren't glued to their positions. They roam.