To add to my comment-- I think the CNN headline got it better without the softening euphemism by pointing out it was a success: "A SpaceX Mars rocket prototype just exploded. It was still a success"
I don’t think it exploded. It broke up by hitting the ground (not by exploding) which caused fuel and oxygen to leak out, which then ignited in a large fireball. But maybe this is splitting hairs. It sure looked like an explosion.