In any case, the Huawei Matebook pro x would seem to fit all but the default unix OS requirement.
I dont think any PC comes with any unix os by default, other than apple, but given the ease of setup I'm not inclined to view that requirement as anything other than a way to select what you wanted a first
If I could be guaranteed that everything work perfectly out of the box with no weird driver issues when I burn and install an Ubuntu .ISO, I agree that the OS being default is not a necessity.
But I've only heard of this being the case on a small whitelist of "known to work well with Linux" devices, like Thinkpads, etc., which don't fulfill the other conditions.
Again, I'm not just arguing ideology, here: I'd be genuinely happy for you to show me a non-Apple laptop that meets my criteria, if one exists.