I suspect people have been hesitant to remove the information because it's not clear why it was added in the first place; on the whole, Wikimedians are content collectors rather than content removers, unless they are very comfortable that the information being removed is of no significant value or is actively harmful.

Having a quick glance, I see comments like "no women were elected to Arbcom" for projects that don't have Arbcoms, and references to no women on projects that don't exist for that language group.

As the majority of the data was completed by Laura (thanks for all your research!), perhaps she could help the list to understand what the intention was in including some of this information.