A little off topick: Interesting technique to deal with the thrust punch. The only problem is that thrust punches aren't thrown like that in application. They are usually mixed in with a series of other punches and kicks. It's a much closer range punch than what it looks like when drilled. I have never thrown a thrust punch from that distance. My understanding of the thrust punch is that it works off the concept that even if you retreat you'll still get it. If I was a Wing Chun person I would probably train to work that technique with a boxer low jab. The only reason I mentioned this is because the footwork will be off. You would need to use different footwork to deal with a thrust punch and the technique that is shown will most likely not be the same for thrust punch. The footwork looks valid for what is shown but I'm pretty sure it would change if the punch was thrown realistically. I understand they can on work with what they have. Other than the footwork looks solid from someone on the outside of WCSome wing chun footwork
I watched some of their other videos and came across this one. Students like the one at 3:49 are awesome to have. They step out of that "one punch" training that I don't like. They move around and change things up and that's where you can see the real footwork vs the training and drilling footwork. At 3:49 you can see his footwork shuffle and his stance is longer. The same guy that moves around lengthens his stance as well at 4:31