The range given for carbon dating this artifact is 568 to 645
If the radiocarbon date is is 645, then it isn’t older than Mohammed. If it is 568, it, it predates Mohammed by 2 years, and the mythological account of the genesis of the Koran by some some 42 years.
The dispute the article, or the blog points out is between experts, some who see the Koran as being amended by Mohammed from pre-existing sources, and some disagreeing with these allegations.
The carbon dating range supports either of the claims.
The fact remains that many of the stories of the Koran predate Mohammed, and were first written in apocryphal Christian writings.