Hamas controls the reporters in Gaza too.... Its reported, Some have been killed by Hamas for not reporting as directed by Hamas.

Any reporters previously associated in any way with Hamas would be a extremely dangerous position.

Israel while having release some information on such journalists would NOT be releasing sensitive information that would give clues how information is collected and associated surveillance techniques. No doubt they and lots other militaries would have amazing tracking and interception capabilities. Israel would also be receiving information contributed by associated powers from other countries.

Also maybe Israel have recruited some Gaza people as spys?