Here's the summary so you don't have to bother watching it.
Biology is real.
1) Small boob to Medium boob: No change.
2) To huge boobs: ~36% more tips from men.

Personally, I don't think the exact number is all that reliable, but there's probably a real effect. I would've been interested to see how women customers react to bigger boobs, but the experiment was very limited in the video.

3) Watch from 19:58 to see the result of how women rate the exact same 12 men, when half of their career description is changed from mundane job title to fancy job titles (e.g. investment banker, cardiologist). +23% attractiveness score purely from that! Earlier in the video women AS A GROUP claim they only scored them based on visuals, but they're lying of course. Do they know they're lying? I'd say they do, because they say different things when they're questioned one at a time.