Aye, sometimes we forget that the market is made up of us mere humans with all our little nuances.
The Pres is big into how the market is doing, he often quotes the numbers, and he likes to see positive returns.
So imagine this, being President he gets to see the numbers before we do, US manufacturing is a big employer, quite a few voters rely on it.
Later in the day of the above twitter post the manufacturing pmi numbers were to be released - imagine him reading those numbers and then reaching for twitter - see how “manufacturers” were mentioned.
Twitter is a useful tool.