hyperpape wrote:
Why do you think any necessitates one? "After the horn has sounded, any persons in the park must leave" sounds fine to me. Do we just have different idiolects?
No, we don't.

See my remark about "anybody" on the ground floor. Colloquial English is not logical. "Any" and "all" can get mixed up, as can "and" and "or". (I have noted that sometimes this confuses native German speakers, BTW.)
In context, the AGA rule statement is clear enough. But from a logical standpoint it uses "any" where it should use "all".