How to use "has_icsd_exptl_id" property in pymatgen query function?

Has this changed? I’m not seeing it in the mapidoc. I’m guessing maybe it’s still just undocumented? (How is the 'theoretical' tag determined? - #4 by shyamd) I do see exp, but it’s not clear if this would be used. Asking here mostly because this pops up via Google search.