Changes in human DNA also aren't 100% natural selection. Effects like gene drift also make up a lot. Saying that reproduction is the ultimate goal of biological organisms isn't quite true for conventional definitions of goal. In pop evolutionary psychology that often get's conflated.

But even if it would be true for naturally evolved humans, AGI can be created via intelligent design. That means they can have real goals that are programmed into them. AGI can be created with a goal to do a task and then shut down. Deep Blue doesn't have a goal to exist in the conventional meaning of the word goal.

is quite valid if steelmaned by

Crappy reasoning gets downvoted on LW even if it's possible to argue for the same position with good arguments.