>>5233073 (LB)
Nope. First, the distribution is nonuniform. Both Q and POTUS are normally more active in the evenings. Second, there were many more than 3 Q posts and POTUS tweets today that could coincide. Google the "Birthday Paradox". Yes, the odds of three zero-delta (or near zero) posts is too small to dismiss as a coincidence. But it's not 2.9B to 1.
9 POTUS tweets, 31 Q posts.
So of 480 minutes, one in 480/9=53.3 had a POTUS tweet. The chances of any single Q post scoring a "hit" would be about 1/53. There were 31 'tries', so 31*(1/53)=0.59 chance of any Q post hitting any POTUS tweet. Not that remarkable. For this to happen three times would be about 0.59^3=0.205, 20.5%, or 1-in-5. I'm glossing over some minor factors.
Disclaimer: I'm not a mathematician and highschool algebra was a long time ago.
But the odds of these 'hits' happening consecutively is something I haven't looked at.