Yes. In the intelligence world that means that it is supported by multiple observations from different sensors, each confirming the other, and there is no credible evidence contradicting it.
As cited for you repeatedly:
...The ultimate assessment that the strike was not the result of an Israeli weapon was based on two primary factors, the officials said. First, the damage from the strike was consistent with a rocket, and not an Israeli munition, such as a bomb dropped from the air or an artillery round, which would have caused significant structural damage to the hospital building and left a large crater. Videos and images show “only light structural damage,” one of the officials said.
Second, analysts were able to track the trajectory based on videos shot from four locations. Two cameras captured the flight of the projectile, which analysts judge to have been launched within the Gaza Strip, the official said. The rocket then traveled northeast, and about 10 seconds after launch, the motor became unstable, the official said. The rocket’s plume fluctuated in intensity, and a few seconds later, analysts observed a large flash. That, the official said, was the motor failing. As a result of the failure, the rocket changed direction, the official said. The rocket came apart and the motor struck the ground, followed by the warhead, which landed at the hospital and caused a large explosion, the official said.
Of course, you don't care about that because your purpose here is not to try to get at the truth or present an honest depiction of events, but rather to act as a partisan on behalf of HAMAS, whom you continue to refuse to admit lied. :-/