I remember this thread! Before I saw this comment, I had already gone to look it up again:
Here’s the initial post of Verionica’s video on booting from ISO files: https://linuxmom.net/@vkc/112905487325961707
And here’s the post on 'The Ventoy conspiracy": https://linuxmom.net/@vkc/112906968594601449
Oh, look. An U.T.B.A.P.H.
https://99percentinvisible.org/episode/u-t-b-a-p-h/