AI is a lot of things. It's essentially just the category of algorithms, control theory, and machine learning.
If you are just referring to AI as in ML, even then ML is at its core a series of processes for tuning control systems. Those ML models are just complex versions of traditional systems from control theory with the tuning handled by the training process.
So yes in a sense, procedural generation, constraint solvers, wave collapse, etc can all be seen as AI since they are just different ways of solving the problem of "how do I believably make/do X in a useful or believable way".
If you are just referring to AI as in ML, even then ML is at its core a series of processes for tuning control systems. Those ML models are just complex versions of traditional systems from control theory with the tuning handled by the training process.
So yes in a sense, procedural generation, constraint solvers, wave collapse, etc can all be seen as AI since they are just different ways of solving the problem of "how do I believably make/do X in a useful or believable way".