And does that mean it can’t be revised at all in the future by the Vatican?
841The Church’s relationship with the Muslims. “The plan of salvation also includes those who acknowledge the Creator, in the first place amongst whom are the Muslims; these profess to hold the faith of Abraham, and together with us they adore the one, merciful God, mankind’s judge on the last day.”
Lumen Gentium was promulgated in '64 and as you note, Nostra Aetate in '65. Even a fairly cursory reading of Nostra Aetate makes clear that Islam is not on equal standing with Christianity.
Muslims think Christians relationship with the God of Abraham, but it does not mean that Christians don’t need to repent and return to right worship of God. In fact, Christians are guilty of, at the very least(!), shirk. Likewise, the Church affirms that Muslims worship God, but this is not the same as fully endorsing Islam. A cursory reading of Nostra Aetate or the surrounding articles of the CCC should make that clear very quickly.