I've done it more than a few times by accident by mashing the jump button following a dive, it happened the most frequently in Swift Stop Station because I was grinding for a gold time, but I really don't know how I'm supposed to do it, I even tried to bypass the wall of death, but because it wasn't very consistent I pulled it off maybe 4 times and none of those attempts managed to get far enough for this skip to be worth it.

Ps: I could find a few more forum threads commenting on this trick, but none of them explained how to do it.

i hold space while in the dive, this makes you stop rolling as soon as you land, and then i press jump quick after i land. It's pretty forgiving actually

Ah well no dice because I'm not fast with my hands. My keyboard inputs are slow despite my good reaction time, bad motor reflexes as I'd like to say. Just holding down spacebar to stop the player from rolling and trying to jump immediately afterwards poses me many problems in of itself already.

you have to hold space when you dive then for max height you need to do jump hold it for a little bit then jump again hold it at full then do your double jump as normal, it is hard, but if you want a alternative that could work for you, if you dive right when you get out of a dive you can then jump out of it at the same time you dive to do what i call a "dive cancel" which gives you a slightly worse triple jump if you jump right after

you have dive/roll, then after immediatly cancel it and click spcae three times to do your triple jump