I think you're kinda missing his point there. It's not that you have to feel the Future Ironworks is bad or else be a hypocrite, or even that they're especially significant unto themselves at all. It's that the story is thematically inconsistent, which means the events that occur feel without meaning. If there is no truth conveyed in the destruction of the Ancients that is not contradicted by other parts of the narrative, then you have to ask why they had to die, beyond the arbitrary mechanical concerns of the scenario? What message are we supposed to take into our lives? Is it immature and stupid to try and bring back a lost past at the possible expense of the present, or noble and self-sacrificial? Or when is it one versus the other?
In Shadowbringers, this wasn't an issue because the story embraced its own tragic ambiguity - it wasn't that the Ascians were better than the Ironworks in terms of their core motive, just that one of their projects required doing overt murders to realize that motive. But the plot around Venat is much more traditionally moral driven; the Ancients had an original sin tied in with the core themes that doomed them, and for that they had to be cast down so that their successors could be saved. But if the story can't sell that sin as something fundamental within its own moral universe, then it all falls apart, and the writing feels dissonant and cruel.
I think the cause of a lot of these problems comes down to the fact that Shadowbringers was written as a realist narrative ("things happen based on the choices and competing needs of the characters"), while Enwalker is very much an idealist ("things happen for bigger picture, thematically-driven reasons") one. They're fine in isolation, but they go together like oil and water, which is not great since they're so inter-dependent.
Is this actually made clear, or just a case of ascended fanon? Emet and Hythlodeus talk about half of their 'people' and 'race' being sacrificed, but that could just as easily mean just Amaurotines. And the quests in Amaurot, particularly the debate club one, make it clear that there are other nations in the world not under their control.