That is completely wrong, and here’s why:
In a vaccinated person, if a virus bunch is breathed in, the virus is attacked and neutralized. All of them, mutated and unmutated. There is still a much smaller percentage of vaccinated people actually getting the virus than the unvaccinated.
In an unvaccinated person, any group of viruses is free to set up house and mutate, with only the person’s natural immunity to fight them. When one virion happens to find the right combination to greater contagiousness, it becomes dangerous as it replicates and is breathed out by the ill person.
Voila. New variant, if it gets to even one other person, who then spreads it to others.
Under lockdown, by the way, it never gets to another person, unless maybe to the people who cart the sick person off to the hospial.
I’m going to post something in a few minutes about how powerful people who hate our country are paying people to spread the opposite of the truth. I’ll ping you.