Frankly I think you're reading what you want to read here. I get that those are hot button issues for many people but here I really think it's just a small joke

Frankly I think you're reading what you want to read here. I get that those are hot button issues for many people but here I really think it's just a small joke because, as you point out, obviously the distribution of fossils has very little to do with gender politics. That being said if you want to take it more seriously sometime sexist bias does taint research in unexpected places, such as expecting that certain tools would've been used by males instead of females for no real reason for instance. It's important to be aware of these biases if you want to do good scientific work I think.