But their behavior can be accounted for with CGI and augmented reality.
In this day and age quite possibly. Not so much back in the Skylab days from which there is plenty of footage of astronauts doing acrobatics in a way that I don't believe could have been done using harnesses in such a complicated way. Do you have any evidence of fakery other than that "it could be done"? You could apply that to anything.
When I look at Jurassic Park I don't believe the dinosaurs are real because I know there are no live dinosaurs any more.
But with this footage, I know people are real, I know rockets are real - I've seen lots of film of them and I saw a Shuttle launch personally once. I know the ISS is real, you can see it from earth and I've seen videos of it doing transits of the moon, one of those was from Jeranism so this isn't RE propaganda.
So on what basis would I think this footage fake? I believe the earth is a globe but if it wasn't it wouldn't change my life, I have no agenda here other than sticking up for the truth. All the "evidence" I have seen of fakery in ISS footage is supposition and vague assertions that fakery is possible or that "it looks fake". That isn't evidence. What actual experience an expertise do you have in analysing footage to claim with any confidence that this is fake.
As stack says, it's only because FE people *have* to think this is fake in order to maintain a FE belief. It seems to be a mess of cognitive dissonance and confirmation bias rather than based on actual evidence.