Coughing doesn't imply C19 anymore than it implies a basic cold.
And, by your logic, should all of the SCOB skaters be presumed to have C19 also since they've been wearing masks during their practices, including their program run-throughs?
I will grant you that she (and probably Chris, as her spouse) should not have been at the arena today, even if they were merely waiting on Brandon's test results to come back. I'm not sure that restricting Meno & Sand from the arena is feasible since they have so many junior and senior pairs teams that they are coaching, though I suppose they could have found someone to assist with the coaching duties until they at least had negative tests come back.
Maybe the USFS is just acknowledging what so many of us have already figured out... You can get Omicron anywhere, from anyone, and it's probably going to be a mild case if you're vaccinated. At least they are still making the teams/skaters withdraw if they do test positive.