According to https://github.com/brave/brave-browser/issues/9631 domains accessed over IPNS are recognised as content creators. I think it used to work for me a few months ago too.
Now if I access ipns://ipfs.tech or ipns://git-tutorial.suzanne.soy, neither of those have the “contribute” tab when I click on the brave rewards icon in the address bar. When these over https:// they are both listed as creators (unverified and verified respectively).
Can anyone confirm if it works for them or not?