If he uses a computer to facilite posting at exact times, it's not surprising at all. And NSA/MI would presumably have the ability to intercept and modify electronic communications, in other words inject data packets, delay data packets, etc. to ensure that a given post arrives exactly on time. Why is it surprising? If Q's markers are time-related, actually it would be surprising if they DIDN'T use technological means to ensure the markers function as intended.
Oh BTW - now the world knows you are a Windows user and probably what version. Next time you take screen caps, it is suggested to trim off any identifying information before posting. There are good apps that can help you do that.