Even Human Rights Watch (anti-israel propaganda outlet at this point) has said it was a Palestinian rocket:
"However, the sound preceding the explosion, the fireball that accompanied it, the size of the resulting crater, the type of splatter adjoining it, and the type and pattern of fragmentation visible around the crater are all consistent with the impact of a rocket.
Evidence available to Human Rights Watch makes the possibility of a large air-dropped bomb, such as those Israel has used extensively in Gaza, highly unlikely."
The claims appear to be founded: https://forensic-architecture.org/investigation/israeli-disi...