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If none of the tests were done during the right time window relative to the onset of symptoms (which IIRC is only a few days) then the probability of them all being negative is quite high.
Even if one of the tests was done at the right time, the probability of them all being negative is the same as the false negative probability for that one test.
I'm not saying they have it but it's theoretically possible they could:
https://www.gq.com/story/julia-ioffe-false-negative-covid-testing