Oh please.
No, the boss said "merge this" and the code has been developed "corporate style" (with a HAL, etc) now the "mean" kernel developers won't approve this
But the Kernel people are right, because the other option would be to introduce code that breaks every now and then and is unmaintainable. See all the ACPI issues for example, that only stopped when Linus said "no changes can break existing functionality anymore"
This depends on whether there is at least 1 person at AMD who has experience with kernel development. If all of the team members all kernel outsiders, then this might confuse/surprise them. Otherwise someone likely raised this as a potential issue.
They didn't listen.