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.
Bonus review of McVitie's Bites mini filled cookies (two bags shown, blue and tan/brown). Russ gives 2/10, complaining about how little filling there is versus the packaging claim and the biscuit dust; on-screen 2/10 graphic matches.