I think we have some misunderstanding here
In my personal opinion, which you can check with current VMware docs ie https://docs.vmware.com/en/VMware-NSX/4.0/nsx-application-platform/GUID-D54C1B87-8EF3-45B3-AB27-EFE90A154DD3.html , you have statement that clearly say:
When you say full support it relates to the fact that VMW is going to support both NSX and Tanzu, as your k8s solution.
If you are using some other upstream k8s cluster of course VMW is not going to provide support for that platform - but NSX is going to be fully covered. At least that's my understanding and as I can see it's valid for newest NSX 4, so I don't see reason that this is going to change very fast.
Last, but not least, Tanzu is a very native environment for NAPP and for sure gives easy of integration of all required components (LB, Networking etc.)
HTH,
Dragan