Yes, def using rebar! I thought that came after the gravel base, but maybe I am wrong.I hope that they're going to use steel in the concrete. Steel is used for strength, but more importantly it's necessary to provide a good bonding grid. Definitely require steel that's tied to the bonding grid in at least 4 places.
Welp, guess there isn’t anything to do now since it’s done ??That seems awful fast on the concrete. I would have waited at least a few weeks for the back-fill to settle.