[tantalor]

That theory is excluded earlier in the article: If you’re lucky enough to have a whole bone, such as a skull, the size, shape, and dimensions might differ between male and female. In the case of fragments, researchers might have to dig into DNA

If obvious differences are very rare ("very lucky") then the bias can not come from collectors.

[daveFNbuck]

The sentence about misogyny not being the cause is the start of the second paragraph. The sentence you're quoting is in the third paragraph.