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My guess is that they just used a fairly large word list, which contained a bunch of euphomisms like Dirty Sanchez.

A good guess, that's exactly what I did.

IIRC, 'Dirty Sanchez' is a slang term for a sexual act.

"pipe" means blowjob in french. Maybe the filter dictionary is multilingual?

It can happen. A decade ago, Apple’s automated App Store processes warned me that “Knopf” was a dirty word in German.

(It isn’t: while “knob” can be translated as “Knopf”, the latter doesn’t have the anatomical meanings of the former).