"Normal" people will just buy the game if it's good.

So it's irrelevant if it uses AI or not. Ie. it's not a sales pitch and not part of decision making process when making the purchase.

There are increasingly more games that use some form of AI generated content, voice lines or otherwise, and nobody could care less, except the people outlined above.

By your own admission its not irrelevant, there are a small group of people who do care about that kind of thing on either side. For an indie dev, that matters. AAA studios can pretty much guarantee at least a few thousand sales, indie devs, especially the less established ones, have far less. For first timers, there'll be none at all.

The thing is though, appealing to the pro-AI crowd is much more difficult. They want a game thats a shining example of what AI can be in gaming. The anti-AI crowd doesn't need that, they've got examples of that for decades. A few AI generated voice lines won't do much to appeal to the pro-AI crowd.