If someone is walking up on you and wants to fight, trying to trap their hands (especially in the way he demonstrates) and break their structure before countering is asking to get knocked out.
IMO it's not a matter of "trying", but more a matter of what you know that you can do it or not. If you don't know what you are doing, this is not what you should "try". But for the opponent speaking, If you are in a compromised structure, will you still be in the position where you can deliver a knockout punch? I would doubt it. I do agree with the initial approach here of going in and "bridge", take contact. But I am not sure that his way to "control" the structure and even more less sure if his way to break structure would work very well when someone is moving around, both feet and upper body. That can be done as a defensive move, but there are maybe better ways to follow up the initial contact. However, this is good practice and there are many practical ways to use the principles taught.
a more realistic (imho) response is to get a good protective guard up (like the Thai Long Guard, or the "turtle," or the "dracula"), counter, and then get away.
When you compete or do sparring with gloves, you don't have the opportunity to get in and attach to you opponent. If you don't have gloves then you don't need to hold on to the boxing mindset where you are not allowed to grab or wrestle. For real fighting, if you know someone wants to fight you that is, just going in and closing the distance and bridge (touch his limbs/doing something with his limbs) as soon as possible, is far better than standing there in a guard waiting for punches. IMO. But you obviously need to practice it in a less stationary manner than shown here.