Ny'alotha transmog

I want to get some mogs from Ny’alotha but I didn’t play much of BFA, quit after the first tier. So I never did Nazjatar or unlocked Ny’alotha at the time, and I can’t see the entrance to it now. Do I have to go back and do Nazjatar stuff to unlock it? Is there a shortcut they added later on? If I group up with a friend who did play that patch and has the raid unlocked will I be able to get in that way?

Hoping someone here who played that tier can help shed some light on how to get in the raid.

Cheers