In what products has he actually been involved in the design? Nothing.
You are absolutely right, no question. Musk just happened to be standing in the corner of the room, doing nothing useful, when ...
- electric cars turned from golf carts and Sinclair C5 to desirable high performance sports cars. including the world's (and most regions) #1 selling single car model
- Falcon 9 1) got made, 2) got designed for cheap serial manufacturability, 3) perfected landing on a drone ship as well as on land at the launch site, 4) turned into a rapidly and cheaply reusable booster with the leading example now at 35 flights in 5 years (June 3 2021 to June 8 2026) and about to overtake the expensively refurbishable Shuttle "Discovery" with 39 flights in 27 years. Atlantis did 33 and Columbia 28, Endeavour 25. Other active Falcon 9 boosters have done 34, 32, 31, 28, 28, 26, 24, 22, 22, 16, 16, 16, 13, 12, 10, 10, 7, 7, 6, 6, 3, 2, 2, 2.
- Starlink bumped satellite internet from a couple of Mbps to hundreds, with plans starting at $45 and zero-cost terminals (with either a 12 month commitment, or returning the hardware if you cancel depending on the region, promotions etc). It gives service in rural areas, remote areas, polar areas, the middle of the amazon, the middle of every ocean.
- Superheavy/Starship are on the verge of 100% reusability, in days (possibly in hours) between flights with the largest rocket ever flown. And also very very cheap and fast to build.