Is this 2P story connected to Nier Automatas story in any way? Does anyone know?
2p doesnt currently exist in the Nier universe, so nobody even knows how, or even IF, they're connected in 14's tie-in. Since they're both squeenix properties, they can always just retcon anything any way they want after the fact.

2p currently is only the second player skin for 2b in Soul Caliber, like blue dhalsim, orange blanka, pale eddy, ect,