According to the story, the guards noticed them and prevented them from entering.
They claim that "settlers" have repeatedly attempted to sneak in to the Temple Mount in recent years, particularly in times of Islamic prayer when it is crowded with worshipers.
I have no idea if any of this is true. The closest story I was able to find was this one from last year, and the Jews were secular:
Two Jewish youths were taken in for questioning by Jerusalem police after attempting to enter the Temple Mount dressed as Muslim worshippers.
According to initial reports the pair are "secular Jews" who were touring Jerusalem together and wanted to include the Temple Mount on their trip; it is not clear why they chose to disguise themselves.