Why fade?

[O.B.Left]

I think this is the reason for fade (or push fade?) of hitters, yet I cannot understand what is written because of my lack of TGM knowledge; I will slowly digest this notion.

In the mean time, I will follow your suggestion of closing a clubface. But how should I close the clubface at impact fix: by using strong left grip or rolling a left forearm or something else?

Thanks,
DK

Rolling the grip in the hands. So situation normal except for slightly closed face (to a degree you arrive at via trial and error).