Aha! It turns out I can remove them individually with the x by their names in each post.
Can't do it from my profile page though. :/
( brb Monkhouse Stampede, Fri 19 May 2023, 19:07, archived)

Be careful not to press X twice, you might get an IT worker after you

( Turtle Power & Knuckles, Fri 19 May 2023, 19:21, archived)