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.