Alright i restarted and warped to chapter 4, i was right, it only allows you the option to release the vampire in the freezer if you leave the armour behind and come back later to pick it up, also the boss monster guarding the armour changes and you miss a scene if you dont wait till later.
Thankfully it didnt kill my run, as i just got literally every other piece of heronium, but im still gonna need to replay this part of the game to see the missed content, also it's really dumb that you are locked out if you grab the armor earlier with no expectation that you'll ever be coming back for it, especially considering the dialogue explicitly implies thats the narrative plan, just lock me out of the option if you're going to penalize me for following the games dialogue, like you only dont rush in because you haven't saved aura, then you do save her, so why would i not go back to take revenge??? Especially when that's the stated plan in dialogue and there's a horde of monsters coming to make sure i can never reclaim the armour if i dont do it now???