You're right about that one. I did it only for the continuity being that I was specifically commenting on his circle.
The humour medicine was a little different. That article was speaking more to the fact that it was believed people had to release sexual energy for fear of death.
The Taoists were the opposite of that. They thought you should preserve fluids to preserve and prolong life.
Crowley's version was closer to your comment on the meme, which sidles with the red-pill version I mentioned above: that conserving your sexual energy essential bestows you with powers, or at least advantage over the "wasteful" ignorant masses.
This is not true. In The Farthest Shore, Ged lost his powers by using them all to ...well to do some huge deed. Not going to specifics in order to avoid too much spoilers.
The "present day" Earthsea wizards practiced celibasy, but it was more a belief or tradition, like Catholic priests.
Those seem to have been relatively widely-held beliefs based on the humour system of medicine, see https://aeon.co/essays/getting-down-and-medieval-the-sex-liv... posted here on HN a few days ago.
Taoists had similar ideas: https://en.wikipedia.org/wiki/Taoist_sexual_practices
Edit: also I'll never spell it "magick" because Crowley was a toolbag
Edit 2: There's also the current meme that (humorously) claims a man who remains a virgin to the age of 30 will become a wizard, which is presumably drawing on all these historical beliefs.