I noticed the same thing in the data, the growth in the US data suddenly flattened.
There could be another factor aside from the obvious intentional manipulation. They might have reached a certain limit in testing. Numbers can't go up if tests are getting backed up and there is only a fixed number of them to be processed each day. Sure, after a while you will still see increases in numbers via an increased positivity rate but that increase is just way smaller than if you increased testing, which the US has done over the past weeks.
In any way we can be sure that while the numbers are plateauing the actual cases are most likely still going up.
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