What's the matter? Don't understand English?

You are wrong, as usual. It's not common phrasing, but there's nothing wrong with it. Similar examples can be had. "You're on the thin side of fat." Sorry you're too dumb to be easily confused just because the words positive and negative are in the same phrase.

Sure, someone who thinks a simple and readily understood English sentence like:

"My test results came back absolutely, positively, negative."

is gibberish has no place judging who is right and wrong. Oh no, that sentence has the two contradictory words in the same sentence....it must be gibberish!

Every President has misspoken, including Trump. For Dubya they even coined the term Bushisms. Unfortunately your mental sickness makes you jump all over something that is not a misstatement. See, I can chuckle when any President makes a gaffe, because I'm not a raving partisan lunatic like you.

I'm more certain than ever that the ridiculous doctor's note from the election campaign was written by him and the doctor just signed it without reading it.

No, the 2016 one. Do you remember the wierd doctor's note about his health checkup? It was pretty much as a response to the first memes that noticed how overweight he is. And it has the exact same confusion over what a positive and negative result is, which no actual doctor would EVER make.