you can have feelings about that, or you can get stuff done.
I’m a volunteer here, “I” am not doing anything. I gave you my opinion. do with it whatever you like.
at least for the main repo, the pull request template asks the contributor to acknowledge that they are able and willing to submit their contribution under the existing license.
you could open an issue and ask for a clarification on those specific contributions, i.e. for someone to add an explicit license to the model.
that is what you’ve been advised to to: ask the original contributor about this. alalek might have been less than explicit about this but I think I have been.
you really should go get a lawyer. they at least get paid to deal with this.