I don’t have anything specific to out him with, he mostly seems like a genuinely nice dude, but here’s my take on him:

Louis Rossmann pretty much supports right to repair because he ran (runs?) a board-level Apple device repair shop and his life would be much easier with access to schematics. And he’s got a YouTube channel that got loads of views from blasting Apple with all this, so he must’ve realized that this would be popular with his viewers too.

He’s also a libertarian. In many areas, it seems like he’s for LESS regulation of companies. Including on workers’ rights, because “the free market will make everything great”. Are we really sure his right to repair stance is genuinely because he wants the best for everyone?

That said, if I had an Apple device with a bad logic board and I was in the area, I’d take it to him without any hesitation. I honestly doubt he’s scamming his customers. Like, ever. I think his business practices are good, it’s his political views that are suspicious.