NFL knew he was vaccinated, there's no requirement to tell the truth to the general public. He and I believe the Packers were fined for not complying with mask rules and his presence at the Halloween party. And him saying other things that you strongly disagree with is not grounds for punishment.

And the whole putting others at risk thing is a big reach. Even if teammates/staff didn't know he was unvaccinated, I doubt they acted any differently around him because of that. NFL players are out mingling with the general public constantly, and many people are unvaccinated. And as we know, the virus spreads just fine amongst the vaccinated, even if vaccination helps slow down spread.