So this could illustrate some issues that people should bear in mind when considering the antigen policy.
Apparently viral load ramps up really fast, like hours, until the immune response kicks in, and it is at that high titre that you are most infectious. If everyone tested everyday, and isolated on a positive, then this could all be over by Christmas.
The two negatives were PCR tests. Those are different from antigen tests. The blog post you've linked says there is a problem with false positives with PCR tests, but that doesn't seem to be relevant here, given that both of those results are negative.