I'm going through a bit of my own NSX V2T migration and it's quite a little "dance" so to speak. Due to the nature of our infra and what parts of products we've implemented we seem to keep hitting interesting little road bumps.
By no means am I an NSX expert, but you may want to give the following ESXi command a whirl to see if the old NSX-V VIBs are still installed on the host or not:
esxcli software vib list | grep nsx
If NSX-V is installed it should return something similar to the following:
esx-nsxv 6.7.0-0.0.20506747 VMware VMwareCertified 2022-11-21
At least with that you'll be able to see the version of the VIBs installed which may help troubleshoot a bit.
Hope it helps or at least start you on the right track.
