A few of possibilities at least: (not mutually exclusive)
- Kash is a fool (unlikely)
- kash is getting attention for his book (very likely)
-kash is a Q reader / aware of Q (likely)
-kash is drawing attention to Q on purpose (not much evidence either way)
-kash is Q inner circle (highly unlikely)
There you have it, it is most likely that he heard of Q. And thought it would bring attention to his book. (Which it is)
Wait, you left out the possibility that this is a secret signal to the QAnon loyalists from the “white hats” that Trump really will be reinstalled in office after Joe Biden and Hillary are secretly arrested in the middle of the night (and then released with ankle bracelets after a sealed indictment).