This 2P? Not at all - the story we will see in the raid, involving these characters, is specific to the universe of FFXIV and canon to the universe of FFXIV. We will certainly see plenty of elements inspired by Nier Automata and its story, but they almost certainly won't be connected in a narrative or canon sense (like 99.9% certain...I won't say 100% because who knows with Yoko Taro, lol).

Our version will basically be "What if Nier Automata type stuff happened in the XIV universe, what would that involve?" rather than a spin-off adventure involving any of the characters from the actual Nier Automata.