Meh, there's plenty of things I criticize Trump on, but this is not that bad. Basically he's saying we've ramped up our testing capacity over the past week, which is definitely true.
He is not lying, his tendency for broad statements and hyperbole is just naturally misleading when specificity and nuance are required for understanding.
Directionally he is right though so it is not the criticism to pounce on.
What gets me is how far behind we have been from day one on testing. We had a great deal of warning... so what is the lead time to generate tests and set up facilities?