No it is a fork. Because anyone who holds private keys on bitcoin (segwit) will have the same private keys on bitcoin 'gold' blockchain just as it was with bitcoin cash on the last fork.

Premine is different, means the coins are all created up front and held by the devs, who typically sell them with an ICO or something.

I think the bitcoin cash fork was kind of warranted. Segwit was a huge change to bitcoin which many people didnt lke so to create a fork was justified. This I don't know. Too many forks could be damaging. I don't see a great need for this fork