Yes, but I think in a very messy and unplanned way.
It is not a fork, because they will not use the initials blockchain of grin, so it will be a new currency that uses the grin code at the beginning, like LTC and most of the cryptocurrencies that use the BTC code in some form.
Bitgin have a very poor and unprofessional website, not much information about mining, social networks, wallet. They will throw something they have done just to show that grin is wrong with the infinite generation of coins.
I also think that grin is wrong with the infinite amount of coins, but bitgrin should have created a good project instead of a copy paste and change in the number of coins that could be generated.