Actually, thanks to relevance @JasonWalker posted in a different thread for seeing who has a particular analysis activated, I think I’ve got it:
(multiplicities of it, it) of unique values of ((names of it of activations whose (active flag of it) of it) of fixlets whose (analysis flag of it and exists activations whose (active flag of it) of it ) of bes custom site whose (name of it = "[redacted]"))