To be fair (pun intended) very, very few people ever use the USB-C port for anything other than charging and maybe syncing photos to a pc.
The connector itself costs like 8 bucks, I don't know how much more expensive it would be for them to design the signal integrity in their motherboard, required to carry the video stream.
Still, for the price and for the market segment they're targeting, this and the lack of a 3.5mm jack for sound is inexcusable.
He's also a multimillionaire married to a billionaire, which helps. Him, not the voters, but it helps.