Not sure what proxmox has to do with this? All this is doing is allowing VMware workstation to run without out of tree modules, it means nothing for anyone else
Notably for CPU only. And on other platforms they already did.
Broadcom would like to clarify that while using KVM for the CPU virtualization, they will continue to rely on all of the existing VMware virtual devices for graphics and other functionality. Also on both macOS and Windows they have migrated to the native CPU virtualization frameworks.