Yeah, anything that gets uploaded that uses your old name automagically will get tagged with your new name instead.
It's a pretty miraculous system, when it works as expected. But because computers are doing whatever we tell them, if we make mistake in what we tell them to do, it can get weird. Like, you had two verified links that were identical, one on each tag, and when I aliased them … whoops. Can't have to identical things in the same place.
That's purely background and nothing anyone has to worry about, but it's one of the "Whoops" things that can happen that sometimes means it takes a while to do something that on the surface looks pretty straightforward and easy.
I guess what I'm trying to say is this is a really cool system and it works great, but it's also a pile of rapidly spinning gears that don't look to see if anything's in their way and there's no safety cages around the spinning shafts.