I'll give MS the benefit of the doubt and say this is because of Thunderbolt. I don't think USB4 is in Ryzen mobile yet and won't be for a while still, so I'd imagine having TB3/4 is better and it is a selling point for laptops. While USB-C is neat, I still think TB is better, slightly, and better integrated in an all-Intel ecosystem.
Other than that, I'd say at that price point and power level Intel should be similarly matched to AMD for what these are targeted for, so Intel may have been either cheaper, a better deal in bulk, or easier to integrate in their overall design. Or at least, I hope that was the case.
I would still prefer an AMD APU in this segment, personally, but I can't deny TB does make a difference for these machines.
EDIT: I was corrected and current Ry6K mobile does support it, with an asterisk:
https://www.pcworld.com/article/703578/usb4-support-amd-ryzen-6000-laptop.html
Regards.