Is it called Node-Locking? to make it so the solver tells us how to play against an opponent who doesn't bluff much or has stats like a reg? can you input stats for solver to play as a specific villain?

Yes. You select the strategy for the node your locking.

yeah it's called node-locking. At least on GTO+, you have to manually select what they do for each combo, you can't say "bluff less" or "overfold by x%"

on Pio 2 you kinda can

Ah, is Pio2 worth it aner0?

Looks fun, but reluctant to rebuy if it's just novelty. I don't think i'd get much out of gto trainer either

OP: I've had Pio 2 years and barely ever node-locked because it's mildly complex. If you have a good sense for how fish play then you can unlock vast swathes of EV against population and specific player leaks but tbh, I think while it might be a powerful feature, your own game and understanding of gto needs to be at a level where you can utilise the information properly both in and out.

Personally I have a gazillion other more important leaks in my game and understanding of solid gto play to begin thinking on that next level of how to constantly re-adapt to fish tendencies. Although of course having some knowledge of where Pio would swing is invaluable. In some ways once you've set it up a few times you get the idea anyway.