He has a very particular set of skills; skills he has acquired over a very long career. Skills that make his projects a nightmare for people like you.

Mark Rober's dart board was much, much harder to create. The projectile was smaller and faster, and the board had to move to a much more precise location. Shane's backboard only has to track a normal speed basketball and has a decently sized margin of error. Not trying to discount Shane's work at all, it's still very impressive, but not nearly as difficult a problem as what Mark Rober solved.

It looks like he started his channel in March, so I'm guessing he just had a backlog of things he's been working on to make videos about.

Large disposable income certainly helps - things come together a lot faster when you have proper tooling. Just looking at his site he has a cnc mill, plasma cutter, welder, access to a laser, casting furnace, 3d printers, etc. Looks like he's got the money to just buy the right gecko drives and linear actuators instead of scrounging for months to get parts off ebay.

Maybe he has already worked on them before and it's just now that he's releasing the videos.