For those who don't know, the daily covid positive case count reports the number of positive cases returned for that day. If an area receives a thousand positive test results on a given day, then that is the number of positive cases for that day.
When a government has completely failed to provide adequate testing resources, or the stress on existing resources due to a pandemic becomes so great that health officials can't keep up, some educated guesses have to be made. Sometimes they are wrong. Generally, most health experts agree that the actual covid death count is higher than reported due to the number of people who die having never been tested.
Sure, take out a few thousand in Texas and Florida if you want, for incorrect assessment. Doesn't change the fact that both of those states have over 300 thousand cases. Nobody believes that the trump administration is going to improve the accuracy of that reporting. The trump administration has never been honest about anything, and they're certainly not accountable. There's no legitimate reason for them to want to change the accounting system right now. But there is a very clear reason.