You think Israel shows every bit of intel they have???? The last thing they showed being 2017 doesn't say he was only Hamas for four years.
The basic problem here is that all the terrorist groups over there call their propaganda people "reporters". In a sense they are, they are reporting on events. That does not make them not considered combatants, though. Israel has found terrorist affiliation for about half of the dead "reporters", but that doesn't make the others civilians. Hit a combatant, the person next to him is probably also a combatant.