The moment of creation would have destroyed timlessness, and the "changless" creator would cease being changeless (and timeless).
Since we know we exist there never was an eternal, unchanging creator because timlessness and creation are untenable.
Since we have evidnece we exist...guess what doesn't! :)
There was no moment from the eternal perspective; but for creation it did destroy timelessness [probably more accurate to say it began time]. The best estimate is 13.75 billion years ago.
I don't follow the logic that the infinite/eternal causing the finite to exist necessarily destroys itself or it's attributes.
Haven't really thought it through but, we could perhaps take "laws of physics" from your #1129 as an analog. They continue unchanged - and must continue as they are in order for the universe to work - new creation to become part of our finite existence.