Another issue with the AA kisses is they don't make sense. Even if AA turns them, he does not have control over them until the tadpole is gone. He should still be putting on the love charm and manipulation for his own self preservation.
The Dark Urge and a powerful Tav can still kill AA if they wanted to, even after being turned, due to the tadpole. If AA shows his abusive cards this early, before he even has control over them due to the tadpole interfering with his control, then Durge/Tav have every reason to kill him before he controls them. I don't buy that AA would put his life in jeopardy like that, by abusing a spawn he has no control over, before the Netherbrain is dealt with.
Also, the only reason people think Tav is a spawn is because of a dev note saying they are a spawn. However, if you go off how Tav is turned in-game, they are turned differently than how spawn are turned. The blood of the creating vampire is not used to make spawn. It is significant that Astarion gave Tav his blood. The reason it's a small amount of blood is, in vampire lore, giving a newly turned bride too much blood will make them go insane. It feels like the writing of Astarion was handed down from a master to a pupil who isn't aware of the intentions of the original writer, so what we're left with are kisses that don't make sense and lore breaking dev notes.
I've been thinking this too. Even if it's just fake, (which I don't think it is, we get canon narration that ascended Astarion loves Tav) Astarion was so careful with the way he acted before. He acts lovey-dovey and even lets Tav break up with him until the tadpole is out of play. But now for some reason he's okay with showing his hand and treating Tav poorly? Maybe he feels like he's strong enough now that he doesn't need Tav's protection or that he could take them on in a fight and win. But it seems out of character for him to just show his whole ass like that before he can control Tav when his goal in the end is to have them as his spawn/consort. What's the point? If he wants to act like that it would make more sense for him to wait a while until the netherbrain is dead.
If it's just to show that he can treat Tav however he wants and get away with it, that relies on Tav humoring him and that seems like a big gamble for him that previously he wouldn't have taken. Even if he didn't care about Tav and their feelings anymore, why would he want to alienate an ally to help take out the netherbrain? He can be smooth-brained sometimes, but he's not that smooth-brained and it goes against everything we were previously shown about his behavior.
