I can't figure out which numbers you added to get 52.2% renewable. I would say wind, hydro, and biomass are renewable, with the possible addition of nuclear. Even just wind and hydro add up to (slightly) more.
Regardless, I agree that getting fixated on the "renewable" label is not particularly productive. What matters is "zero-carbon".
If we want to get pedantic, there's a finite amount of fissile material. But then again solar isn't technically renewable either, since there's a finite amount of hydrogen in the sun.