It may not have gone down as they’re saying here — these may be the remains of vanquished enemies / prey, so this is the evidence for a bar-b-q.
Actually it claims most of the remains were children.
Seems to me to make much more sense that times were difficult for some reason and they ate their own children’s flesh and bones(for the marrow).
Whatever bones remained afterwards were deposited in the cave. Almost as if...they did what they had to do to survive, but still harbored some level of remorse.