No, he's not hurting the repair business by making public a fix that cannot be realistically guaranteed by an honest repair shop.
The intent of showing this trick was even communicated; to afford people time to save up towards replacing the set in the near future.
The permanence of this fix is highly uncertain (it could last for years or only for days), which is why it can't be guaranteed. With this fix, there is a good chance that the fault can get worse and cause the symptoms to recur in such a way where the only remedy of the problem is a panel replacement.
If this fix were guaranteed and it happened to fail within the warranty period, the shop would be obligated to remedy the problem free of charge as a condition of their own guarantee. That would mean performing a panel replacement at their own expense or buying a new HDTV of equivalent size and features for the customer, whichever costs the shop less to honor their warranty. In that case, the shop would lose a lot of money on that one job.
As for his other repair videos, the repairs he shows requires a significant skill set as well as an investment in proper repair tools in order to perform the work correctly. Even with what he shows, it wouldn't be of help to a person who doesn't have the knowledge, experience, and the tools to do the job right. It would only help the customer better understand what may be done by a repair tech.
If you have actually worked in the business, then you would have seen, first hand, the additional damage that's been done by a kitchen counter tech because, for example, he thought a high powered soldering gun would be a suitable substitute for an adjustable temperature soldering station for working on a printed board.