Oh wow you’re right - and neither “autonomous system” nor “AS” are much better keywords! I think this post from 2017 [0] is the one I’m remembering, but I’m pretty sure I saw another one more recently and now I can’t find it (edit: skitter found it! see sibling comment)
“BGP” is a signal-yielding search [1]. And any post from benjojo’s blog [2] is always a must-read.