I think her intent was to say that a bunch of theirs stans had commented their symptoms/positivity also lasted just a few days (which wasn't the case - there's quite a number of comments saying they were positive for awhile), and so in her skewed logic, if the stans' were magically negative after 5 or 6 days, then of course Dim would be too!
It's almost as if ....she doesn't remember that Tim had it already once before... and would remember how long the symptoms / positivity lasted...
I guess that's too hard for her, so she needs to ask her "support stans" for the answer.