I mean even in the category extensions it isn't in there

I'm pretty sure there is. I believe it's "20w14∞" in the category extensions. https://www.speedrun.com/mcce#20w14

It is, it just isn't called the infinity snapshot.

The Minecreeper April Fools is also present in category extensions

20w14a (infinity) and 15w14a (love and hugs) snapshots are in category extensions but there are no shareware, 2.0 and 1.RV-pre1 versions