As far as just supporting running on POWER hardware, that should be a non-issue (none of the core code does anything CPU-specific) even though it’s not well tested.
AIX, on the other hand, is not really supported right now. I believe all of our dependencies work correctly on AIX, and that we don’t do anything that would break because of different runtime semantics on AIX, but we don’t have any dedicated data collection code for it either, so usability would likely be rather limited. I don’t think there are any plans right now for us to officially work on it due to both the relatively low market share (AIX is one of the few commercial UNIX systems that still has relevant market share, but it’s still trivially beat by macOS, FreeBSD, and of course, Linux) and a general lack of availability of AIX systems for us to test on.
However, if someone from the community wants to step up and contribute code for this, we’ll be happy to review it and probably end up merging it, though due to the aforementioned testability issues we probably won’t be able to guarantee a level of reliability equivalent to our Linux support.