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.
Looks sexier but doesn't taste sexier; very bitter
The newest in the series, green with lime zest/rind blended through. Russ finds it very bitter and essentially the Limoncello Spritz plus lime peel. The 'that one's way better' line is ambiguous but given the lower score it likely refers to the original.