Okay, having had some space from the ep -- I don't actually think we're meant to take Louis' apology as necessary. I think we're MEANT to be like "wtf Armand," recognize this is torture, and see Louis' final "apology" as a last ditch attempt to get Armand to let Regina, himself, and Lestat go. Louis hits a nerve and gets real, and Armand didn't actually want him to. So he leaves. And/or realizes he's run out of time, and leaves.
Lol hear me out. We know the actors know where the story is going. Both Sam and Assad have talked about the Lesmand dynamic like it's the canon book dynamic. We know these writers drop hints and intentional misdirects, and Rolin has said this season is very much a Part 1. They also made Armand *explicitly* villainous, and set up things they know they haven't addressed.
We still have no idea why Armand had Daniel take Lestat's head far away from his body; why he was screwing with his band; or how Alex is involved. We still haven't seen things the show's dialogue or subtext has implied (Lesmand assault, Lestat coerced into the trial). They keep mentioning the Paris coven without showing us what problem Lestat "threw money at and ran away" from. We still have no understanding of why Armand built up his new coven, no understanding of what's going on with Daniel. They left a bunch of hanging threads. I think they WANT us to look at the disconnect between Armand's words and actions and think "...is this really what you were up to, Armand?"
I don't know, that moment with Armand over Lestat's body felt intentionally icky to me: he trails a hand over Lestat's chest in this grossly possessive manner when he says "enjoyed ruining for the sake of ruining." Maybe it's my Book Goggles, but that feels too "no joy on earth like the raping of an equal" to me to not be intentional.
Look, I'll say this: hope dies last.
I'm... not sure I subscribe to Louis' apology not being honest there, or a last ditch effort.
Louis was dying, he was only able to communicate telepathically.
There was ZERO reason for him to believe that Armand would actually save him or let him be saved, because it's been firmly established Armand does not really do that.
So no, I do not think that apology was fake, actually. There's levels to that scene on all sides that I find icky.
But... yes. They talked about things. The actors I mean. And yes, hope dies last.