Setting aside my well-publicized disgust of "garden sprayer" brake bleeders, I see two mistakes he makes.
1. He doesn't bother to remove the contaminated fluid (looks black!) from the reservoir, wipe the dreck out of the inside of the reservoir, then re-fill with clean fluid before bleeding. He's bleeding the contaminated fluid into the ABS system. Is this catastrophic? Probably not, the ABS will have contaminated fluid in it already. The best I can say about his procedure is that the worst, most-contaminated fluid in the entire system is usually the stuff in the wheel cylinders, which he bled out...eventually.
2. He uses an incorrect adapter to pressurize the master cylinder, even after looking at the service manual where the illustration clearly shows that the plastic reservoir isn't supposed to be pressurized--the proper tool fits down inside the reservoir, inside the master cylinder inlet ports, so the plastic housing isn't stressed by the pressure-lid hold-down chains, or by the fluid pressure. Aftermarket adapters function the same way the GM Special Tool does--allows a pressure bleeder to pressurize the master cylinder without stressing the plastic reservoir.
I'd have cleaned-up the reservoir, flushed the contaminated fluid first, then bled the ABS, so the ABS gets the cleanest, purest possible fluid during the automated bleeding. True enough, the contaminated fluid in the ABS mixing with the fresh probably means you'd want to flush the fluid again.
Nobody working on commission is going to flush the system twice. Damned lucky if they flush it ONCE. This is why I bought brake-bleeding tools.