This is classic misdirection, textbook Sun Tzu. The post you linked is vague. Is Q saying "No, the earth isn't flat" or "No, I will not shut up the flat earthers"? Obviously people are assuming one thing, but with Q, things are never obvious.

Even if that was what he was saying, we know sometimes Q uses misdirection to throw off the DS. Hillary Clinton wasn't arrested and executed and we know that was to throw off the DS and cause them to scramble and panic. Being unpredictable makes Q an impossible foe. If he came out and states that the earth was flat, there would have been a huge backlash because so many of us have been programmed to think spherically. We weren't ready then, but I think more of us are ready now.

Disinformation exists and is necessary.