Freemen are being oppressed, but they aren't the weak ones in Dune not by a long shot since they even have enough wealth to outbid the empire on satellites in orbit around Arrakis.
I want to see Dune God Emperor adapted now that would start getting to "seriously weird" territory.
This is a fine line to thread and I haven't seen the movie so I can't comment as to how the handled it, but while the Freemen don't have interplanetary domination in mind and Paul does lead them to Jihad, it's not like Avatar where the native are being exterminated and some random guy leads them to military success.
The ridiculous thing about that narrative is that an alien with their own agenda (most likely not for the benefits of the native) is somehow given leadership
The thing is all of that is explained in much more detail in the second part of the book. You know, the part that's not a film yet.
it seems more like condemnation of the concept of leading, or controlling, as opposed to educating and liberating. The white savior element is not neccessary to convey that message.
None of this stopped me from really enjoying the movie - though I think highlighting the ambiguity could make it into a really great movie. The book does it by exploring how the systems work in the world which rarely works well in movies, so I'm not sure how part 2 could do it without it feeling "tacked on"
Given some folks are complaining about the "white saviour" trope in Dune, it would be interesting to see Dune Messiah be made. It's not like Herbert wasn't aware of the idea, given what he knew about (e.g.) T. E. Lawrence ('of Arabia').