Two different views. Like Covid who, what do you believe.
And even a fully vaccinated person can still play host to an evolving virus, in situations where the vaccine prevents illness but still allows a virus to replicate. That appears to happen even with the most effective COVID-19 vaccines. So, viral evolution doesn't just occur in the time between shots.
But researchers say that as more and more people get vaccinated it will rob the virus of its ability to mutate.