That's the CDC's reporting, which, if I recall, no one has been using. Some of the states where this practice has happened have reversed and corrected their numbers. No one has claimed Florida, the state we're mostly focused on, is doing that. In fact, on their dashboard, they have a separate tab for antigen reporting.
The failure of FL's death rate to decline in any significant manner and it's overall absolute numbers of positives for the disease bear witness that it's slow drift up of percent positives is to be expected.