No one even thought to ask about it in the debate.
ITT: people resistant to the idea that what the judicial branch is doing is seriously wrong.
No one cares because no one really doubted that the immunity for official acts was going to be a thing.
The sneaky part that is problematic was making official communication channels inadmissible even for non official acts. That part is what buried the jan 6th trial for Trump, because it relied on communications through official channels as evidence.