They may be confusing it with other Venuses like the Venus of Willendorf - there has been some discussion around the possibility https://www.jstor.org/stable/2744349 - but the Venus of Hohle Fels has no head so the argument is more difficult to make for it.

I also think being a self-portrait doesn't preclude the possibility it was pornographic or the more conventional (but imo also nearly equivalent) interpretation of them as fertility fetishes, as the original reply implied.

Can you provide an opposing source?

I didn't make a claim or refute yours, I was asking for a source for what you believe is disputed in the academic community.