北哥 ([Big] Brother North) is a nickname fans call Jin Xian. It most likely comes from his Weibo handle name.
He uses the same “I’m loved by all” idiom in this interview and his interview as Xia Yan from Tears of Themis and LOL he sounds so threatening here. I can’t unhear it anymore when I see Xia Yan. 北哥，你真厉害 www
EDIT: I realised after playing the game that the term “Taoists” doesn’t exist in the game world so technically all 仙长 are immortals because they cultivate spiritual energy. Ignore the “taoist” in the interview subs!