Trump will be on the ballot in CO.
Why?
Because the Colorado Supreme Court, within their ruling, has stayed the ruling until January 4th, the day before the ballots are printed for the Colorado primary.
However, once Trump appeals this to the U.S. Supreme Court, which he will, the ruling is stayed until the SC rules on it. This means Trump will remain on the ballot until the U.S. Supreme Court rules on this, which will come AFTER the ballots are printed and the Colorado primary has been conducted.