Elon Musk is 49 so his risks are very low with COVID. Elon is a multi-billionaire and will be able to get the best treatments.
Having two positive tests out of four then this is 99% likely that Elon has COVID. Early stage COVID rapid tests only have false positives 10% of the time. False negatives are about 30%.
Elon said he had the symptoms of a typical cold with nothing unusual so far.