Yes, and this guy is NOT a crackpot. He has an extensive professional resume.
But like all things on the internet, use your own judgement and experience and if you decide to make some changes, test it before jumping in wholesale. Here's my process:
1. First, there has to be a performance reason to change. In other words, I'm having a problem and seeking a solution. Don't make a change just for change's sake or because someone tells you its better. If it ain't broke, don't fix it!
2. Is the proposed fix logically - is the fix reasonably plausible? Is there a cause and effect promulgated in the premise for the fix?
3. Test before adopting the fix wholesale - does it seem to work. Expand the test to include more data to validate the fix.
I followed this process for his proposed cleaning method, and it work terrific for me, solved my problem of first shot flyers and the need to season the barrel for consistent point of impact. I was at first very skeptically because all the experts predict all kinds of bad things will happen if you don't remove all the copper from the bore. The borescope shows all this bad stuff, and it must be removed so it is claimed!
Regarding his premise on "barrel break in", I've always done as he has done with no adverse effects. The video on solvents surprised me. I don't disagree, but I prefer Bore Tech C4 since my testing reveals that it does a superior job of removing carbon fouling - better than anything I ever used. So, the latter is an example of taking what you read with "a grain salt" and if what you currently doing works, don't fix it.