It does seem odd to call them non-Wittnesses even if it wasn't to demean them in some way. Maybe just a PR move written by one of the "10 years of reading the Awake" educated JWs.
Honestly that number seems rather low considering, as snare&racket and AudeSapere pointed out, that many of these are likely non-baptised children and mates. And it didn't say they were permitted to enter, just that they were seeking refuge. Wonder if that has any meaning?