It’s kind of hard to say if anyone actually “supported” Venat’s plans since, again, it’s now been established she told nobody what her true plans were beyond an ideological opposition to Zodiark and the impact he would have on their society. Forget Azem - it’s now impossible to say if the people confirmed to actively be on her team would have agreed with her full intentions. As is, never mind the “kill everyone and establish a new world order where suffering creates strength” part of it, Azem refused to join Venat on the principle of just making a counter Zodiark primal.

I would say, if anything can be inferred about Azem from both the WoL and Ardbert, it would be frankly insane to think they would ever entertain the Sundering as acceptable for even an instant - but, well, part of the damage Endwalker ultimately did is that I dunno if I can hold faith in and speculate based on what’s been built up in the past, characterization wise or otherwise, which is unfortunate. Azem will do whatever the writers decide they needed them to do to facilitate their new content.