I've watched a bunch of his videos a while back and he said he had a day job in the tech industry. But basically he's said he wanted a tesla without paying $$$ so he bought some salvage vehicles and did it as a hobby.
But with his channel starting to take off he might have transitioned to a youtube career. At this point he's probably funding a lot of it via youtube income.
Reminds me of Chris, who has the B is for Build channel on YT. He started rebuilding a few salvage cars (BRZ, Lotus Evora) on the side while being a software engineer. Ended up losing that job and now does YT full time basically rebuilding salvage or almost salvage cars.