Which does not explain why there was no change in the suburbs, where
there was just as much publicity.

Frank Crary said:

Presumably, the publicity was about women in Orlando carrying guns, not
women in the suburbs of Orlando carrying them.

It seems likely that a significant number of women from the suburbs
took the gun training program. I don’t see why the publicity would
not have mentioned this. Furthermore, the publicity is supposed to
have worked by reminding criminals of their chances of getting shot.
Should we assume that a rapist will not be able to make the connection
that if he could get shot in Orlando city, then he could get shot in
suburban Orlando.