Isn’t datalog with backward chaining just prolog? Datalog was known for forward chaining (bottom up) while prolog was known for backward chaining, datalog with backward chaining sounds like a misnomer.
You're not wrong - the other big difference between datalog and prolog is that datalog is a subset of prolog's functionality that enables forward-chaining to be safe (gets trickier with negation for example). I was mostly referring to the fact that Graql implements datalog semantics/capabilities, plus negation - but the execution strategy is backward-chaining.