Since btc.com is owned by bitmain, and bitmain are the prime movers on 2x, they're making it look on the surface like they're assuming it will become the dominant chain so it stands to reason that they would be referring to that chain. For the record, I think they don't believe it will succeed any more and are just sticking to it to give them yet another chain to mine according to profit vs difficulty like they're doing on shitcoin cash.