Anything with that many exclamation points in a scam. I work in aerospace. There is nothing you can do as a mechanic to improve the life of a tyre. It is solely a function of design, construction, and use.
When this ******* used the rat-tail file to try to prove his point, the two belts were of entirely different design and construction. When this ******* said the tyres were 4 years old and had 100,000 miles on them, the tiny rubber stubs are still intact. When this ******* claims to spray "303" on the tyre he just has a glass cleaner bottle that could be filled with anything, including tyre-shine. When this ******* says "we are not being paid for this", you know he is lying because his Amazon links in the description are all affiliate links.
Nothing in this video gives any evidence for his claim. If you spray 303 on a tyre it will just rub off after the first drive. 303 isn't even an aerospace product, it just says aerospace on the bottle. **** people like this. This is almost as bad as the "free energy" or "flat earth" youtube pages.