This is getting out of topic but to quickly reply, another remake isn't an official company or game. With that being said, you don't need permission to live stream any game content. You can do whatever you want when it comes to showcasing the game, and this is also happening with any other proper MMO. The only way you would have to get their permission and actually would need to sign an NDA for, is if you were close to them
and they had showed you content that wasn't available to the public which you wouldn't be allowed to showcase.
I would say that sort of '3 month strike' is just nonsense. They aren't legal so they can't do anything really. Its just empty threats, don't worry about it.