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I'm not 100%, but I think they are referencing that Texas has 16 people per 1000 people testing positive, which is more than the CDC recommended number which is 10 people per 1000. If you notice across the top of the panel for Texas it tells you that the number of positive tests per capita is high, which is 6 more people testing positive for each 1000 they test.
The panel you show is the average percentage of positives for any testing. No matter how many people they test in the moving 2 weeks, the average percentage of positives is 11%.
My interpretation is that as long as the first panel is over 10 people per 1000 and the percent positive is over 10%, a state is considered high.
I'm sorry, but I can't get the panel reproduced here, I'm old and not that tech savvy. Usually have to get the IT retiree to help, but he's outside working in the yard.
I can't tell you exactly if these things are what the tweet is referring to, but I did notice the states he mentions are all high according to this site, except for Washington.