I mean I don't remember him being loudly against this. It could be more of a difference of priorities. But it's still interesting. Even if they're not directly connected, two big changes in a row could mean there are more to come.
This has nothing to do with Carmack. Carmack being part of Oculus is a stain on Carmack and his reputation. Don't look to Carmack for moral guidance - he sold his soul to Facebook to develop VR and failed.