I had a huge H. longimanus eat a large cockroach in late September and give birth on November 11th. The babies came out fine, looked healthy, and she didn't eat any, but they all died anyway.
But I don't feel their death had any connection to how long it had been since she'd eaten. (I may have checked on her too much, because she went to hide in a drier spot of the tank where they all died.)