Makes sense, that was actually the first thing I tried, looking through all of the 'Removing Posts' on https://lemmy.world/modlog since the time of my comment (there aren't actually a huge number of them), but the post isn't there.

I just noticed that I actually do have a way to see who the user was though, since the post was still open in another browser window I forgot about. Filtering by user shows they got banned and some comments removed which does clarify to me what happened, but the removed post still doesn't appear in the list which is strange. I guess it's possible it was deleted by the user rather than removed by a mod.