I'd like to start giving people the option of commenting on shorter Cold Takes pieces (which I don't cross-post here or provide audio for). I'm going to use this post for that: I will generally leave a comment for each piece, and people can leave their comments as replies to that.
I didn't make a claim that constant replacement occurs "empirically." As far as I can tell, it's not possible to empirically test whether it does or not. I think we are left deciding whether we choose to think of ourselves as being constantly replaced, or not - either choice won't contradict any empirical observations. My post was pointing out that if one does choose to think of things that way, a lot of other paradoxes seem to go away.