Every number is Russ’s own rating out of 10. Russ has previously stated that he never scores in sponsored videos, so the food he reviews carries no applied pressure or bias.
Overall verdict on the gummies bag, which Russ says is the same as the Kirk's ones. The 5/10 comes only from the on-screen graphic; he says it's a typical Allen's lolly, not a bad pack besides the fart one, but don't buy them.