True asymptomatic spread of respiratory viruses is not a real thing. Symptoms are caused by the virus invading cells and replicating. No symptoms means there is no replication which means there's not enough virus to spread. Any 8th grader can tell you this because it was basic knowledge until the authoritarians needed it to be real in 2020.

I don't think "asymptomatic vaccinated spread" is real, either. I think what that really means is that vaccinated people have very mild symptoms - or don't take their illness seriously - and that's why they are contagious. But a truly asymptomatic person - unvaxxed or not - cannot be contagious.