Yeah, excellent AI pathfinding and behavioural logic is not something you can pull off an asset store shelf and slap into a game. You have to spend a lot of time and resources creating hierarchical subsumption for good AI based on conditional level layouts and player motivations.

I haven't actually looked into the behind-the-scenes development of the AI in the original Alien: Isolation's design, but I would be willing to bet that most of its AI behaviour is all systematically bespoke. So it's not like they can just copy-pasta a plugin for the sequel. If they have a bunch of DEI hires for the AI engineers, then expect the AI to be trash.