All Nunu does is stack Health and Armor
Why is his winrate so high then? His buffs were tank and utility focused.
I mean, according some, champions get blown up no matter how tanky they are. Heck, they get blown up in a handful of seconds.
You can use many scenarios to showcase the alleged rampant damage creep (a tanky champion does damage -> damage creep & a squishy champion does damage -> damage creep & a tank gets nerfed -> damage creep) but not this one.