I would think the mobo would be trustworthy to function. Spying should be minimal.
But for us folks in the "western" world who can buy AMD, Intel, etc at reasonable prices, it is nonsense.
Go into Asia and Russia though, the markup on new hardware is far worse. It makes a lot more sense over there. In the video he is talking about Ryzen 3900X and points out it easily beats this system. However, in a world where a 3900x costs $1000, this is a bit more practical.
As a technical achievement, this is amazing. They must have reverse engineered Intel's microcode, or at the very least reversed it enough to hack together working images. They also designed this board from scratch, recycling parts of boards sent to recycling. That means they lifted the components off, tested to verify function, and then dropped them back on to this board. They constantly have to iterate the board pcb for different parts, with a new bios image as the components change.