I think you guys are being a little hard on him. I bet he would readily admit he doesn't have any uber tech knowledge about setting level and gain staging, vu, full scale, rms, -18db, NOL, digital vs analog clipping etc etc. The tutorial told beginners that clipping your low end interface is BAD and have it go over 0 when tracking guitars is BAD so that's fair enough right? Its not like he's told outright beginners to start limiting and soft clipping their guitars for a phat master lelel.
I bet some people start off and see the red lights and think it looks cooler/sounds heavier so they carry on hahaha
Agree.
Lots of big name producers track hot anyways and if your DI's and distortion is sounding good then that's all that matters. The way he's gain staging is not totally wrong.