Here’s the thing, watching either Machida from fight and their movement in mma resembles their movement in kumite competition. The stances, punches and kicks, foot sweeps. They’ve clearly adapted their karate to mma. Horiguchi was similar, still sometimes is, but in his more recent fights he’s gravitated towards boxing. Conor McGregor even, actually really employs a traditional back stance. Though his striking is definitely informed by boxing. In none of those videos you posted did anyone do anything that resembles Wing Chun. No trapping, no chain punching, no Wing Chun stance. If you want the take the hard line karate competition isn’t real karate... sure. But you’re drawing a line in the sand that 1) most people who actually study the art don’t draw and 2) no one who actually uses it to fight draws.