The bicoin gold is a fork of bitcoin cash, but no one knows what will happen next date they said. Maybe it is the another altcoin that bitcoin made the price will increase again but no one knows.
BTG is NOT a fork of BCH. It is not a fork (hard-fork) of anything, it's a new blockchain.
Bitcoin Gold is not a fork of Bitcoin Cash. If it was, it should not have affected Bitcoin itself because Bitcoin Cash is now running on its own apart from Bitcoin. Anyway, if Bitcoin Gold cannot be considered a hard-fork of Bitcoin, I guess it can still fall within a fork classification. Perhaps a soft fork or a mere copy of Bitcoin.
The term fork is misused here. BTG is a separate blockchain, not a fork. It is merely being distributed in proportion to the BTC chain at a snapshot date.
Confusion may be caused by another common reference : A Crypto based on the prgram code of a forerunner is sometimes termed a 'fork' of the codebase.