Yes by those folk from PPH handbook, though I can't access them. You can watch people do choke hold on internet, literally same effect if done correctly. Also there's a vid mentioned in night-night thread of suspension hanging which also blocks the blood flow and shows how fast the subject blacks out. Unconscious in under 5-10sec. Night-Night megathread has some nice info, I plan to do a guide with the info I've gathered and my setup too.
@Walilamdzi I found the vid: