Exactement...
In the video they used a standard electro-arc welding setup. Using TIG welding gives much better control over the weld quality and amount of material deposited.
A number of years ago, I started cleaning up a 1982 Bertin Reynolds 531SL frame that I bought on eBay in preparation for assembly. I noticed what looked like a crack in the right dropout.
It has Shimano UF vertical dropouts which have a reputation for cracking in that area. I scraped off some paint and sure enough it had a small crack.

I removed the paint to prep it for welding and took it to a frame builder friend to have him TIG weld it.
He used a carbide burr in an air grinder like in the video to notch the area to be filled in. As he did so, the crack broke through so he had to notch the inner side too.
He did a clean job and shot it with some primer. Took him about 10-15 minutes. I left the weld bead intact so that a future owner could see that it had been repaired.
I used some touch-up paint and the repair is almost unnoticeable. It's also probably stronger than new too.
If it were a more severe break I would have had the dropout replaced, especially if it were a more valuable bike.
verktyg