By "Do NOT move north of the Strip", do they mean not to attempt to use the Erez crossing, or are they telling people not to enter the North Gaza governorate?
Ultimately, this distinction doesn't matter as it's being broadcast via twitter in a language only about 40% of people in Gaza understand. It's not for Palestinians, it's for westerners who don't know the difference.
This is like, the one person who they've found who's been willing to offer any criticism of Hamas and this is all she has.