"Adults" does a lot of heavy lifting here because as you get deeper into the KFF report you're misquoting, you find that those 6 in 10 adults who died were exactly like Colin Powell: old, weakened immune systems, cancer survivors.
From the beginning of the vaccines, it was made clear that while they offer more protection than not, older people with weakened immune systems were still susceptible to COVID.
So you're misrepresenting KFF's report deliberately because if you were completely honest, you wouldn't be saying any of the shit you're saying.
But you're not being honest because you don't know what being honest even means.