He maybe , but when you look at the 3 big companies you mention , they spec a lot of their bikes with their own HOUSE !!! brand parts . So they are not buying stems , bars , saddles and seat posts, and such for most of their models as it,s a house spec item .
My $6000 Kona came with a Kona brand stem perfect example .
not that I went through every model, but it seems YT uses a lot of RF and Renthal.
The model in the OP only uses a Sram derailleur and shifter.
It sure is impressive the value that YT is offering when one looks at their part spec…