The planing out of square for the table leg is the bit that’s a plane shaving or two out (more than that and you’d have too much torsion to assemble the table readily I think).

Regarding the part at the beginning about cutting the inside shoulder of the tenon a bit deeper than the outside shoulder – I’ve seen Richard McGuire’s latest series too, but I thought it was only a plane shaving or two difference from shoulder to shoulder. Or maybe I’m confusing that with the way he planes the legs slightly out-of-square.