No, that is not evidence of an event horizon, it's not circumstantial evidence either because it pre-supposes the existence of one. Despite the name, no event

No, that is not evidence of an event horizon, it's not circumstantial evidence either because it pre-supposes the existence of one. Despite the name, no event horizon was directly photographed. Partly because event horizon's are not actually visible LOL. The photo taken can not distinguish between a true black hole, and a super massive object of the same mass. We just assume that if you have that much mass there is no force that is capable of preventing it from becoming a black hole. But, that's not proof that such a force does not exist.