Looking at nutritional values does not tell you the full story unfortunately. Two foods can have identical nutrients but be made up of entirely different quality ingredients as in this case, so I definitely wouldn't rely on those numbers alone!
https://www.rodipet.co.uk/pet-foods/...nior-500g.html
That specific food has enough protein where you could get away without boosting it. You could add extra protein from high quality sources(freeze dried chicken for example) but it isn't entirely needed. I should've mentioned that though or at least that some of their foods would need a protein boost, but there is a critical quality difference with Rodipet and any other food(nothing vague, organic, extremely high quality, whole food based vs processed often synthetic dyed vague junk).