Wow. Normally I think Tom deserves the flack he gets, but not on this one. This is a pretty commonly used set up. My IA uses a DIY pretty much the same as this. Not sure why all the fuss about it.
I just use 1/4 plastic tube off my little hands pump- I got it long enough I can stand up n watch the bleeder valve in the cockpit... works great, it’s identical to my IAs setup just a longer hose to be easier as a 1 man crew
The underlying principle of all bleeding is to move the fluid faster than the air bubbles can migrate back so that they are carried out with the the fluid. Some brake systems have pockets that hold air.