You don't understand. He meant 6.5 part 2. Not 6.6. There is always a ".5 part 2" at the end of every expansion. All they do is split the MSQ for the last patch in half.
Anyone emotionally in touch with how the developers think, from seeing the patch cycles for years, listening to what they say in live letters and interviews, knows they almost never change their formulas. Whether you like it or don't like it, they are consistent.
They start planning the patches of the next expansion before that expansion even releases and they start developing those patches something like 8 months in advance and can't just suddenly announce a new one. The "6.6" that people are thinking of is typically 6.5 part 2, followed by other minor patches (6.5x) that redo seasonal events and crossovers from the past, such as probably the FF15 event.
We also already had the patch cycle shown to us for this expansion at https://forum.square-enix.com/ffxiv/...=1#post5861033
