You aren’t ready for racing if you are contagious. I think a lot of people aren’t grasping that a key difference between Covid and a lot of other viruses is that the R number of the current variants isn’t like flu, it’s like measles. Leave contagious guys in the race, on the busses, in the hotels, at the team briefings, on the basis that they aren’t themselves any sicker than they might be with other things that they would struggle on with and huge swathes of the peloton will get it by Paris. Which, even aside from the health implications for those who get unlucky with their symptoms, will certainly effect the racing a lot more than eight guys getting pulled.
Its not hypercaution about the sick riders themselves. They let Majka continue, at some small risk to his own health, because he wasn’t contagious,