This hit sounds like typical muzzie-led ineptness. It wasn’t Israel.
I believe that it was. Everyone knows what they did. That was intentional, but unprovable. And every bad guy knows that if he were there, he would have been toast too. With regard to their enemies, they made their point: no one is safe. Good for them!
In the past the Mossad has used either a plastic explosive or a small-caliber bullet to the back of the head. Kind of a "calling card" to let their opponents know "who did it" all while preserving plausible deniability.
I agree that this does not look like the Israelis.