I'm reminded of that time a Nobel prize winner used the "authority" he generated from winning the Noble prize to convince everyone that Vitamin C was a magical cure-all for all disease.
Being an amazing HIV researcher does not mean Streeck has an appropriate background in coronaviruses to be an authority in that field, especially given that his team has (a) found outlier results at odds with every other study thus far published and (b) is making a broad policy pronouncement based on studying a single family's household without considering confounding factors, like say the family cleaning the house before the researchers visited.
Being an amazing HIV researcher does not mean Streeck has an appropriate background in coronaviruses to be an authority in that field, especially given that his team has (a) found outlier results at odds with every other study thus far published and (b) is making a broad policy pronouncement based on studying a single family's household without considering confounding factors, like say the family cleaning the house before the researchers visited.