1) No, such statements are not appropriate. We should never say that they are Allah, because nothing is like Allah nor can anything be compared to Him. Yes, what would be appropriate to day is: Imam Ali is “God-like” or in Arabic “Ilahi.” It means he’s a man of God and everything that he does is for God and he has imbued himself and his actions with God. But to say Imam Ali is Allah is not appropriate.
2) It seems that the Nour of Allah is sempiternal and was not created. It’s a dimension of Allah’s power. From this Nour Allah created the Ahlulbayt (a).