You misunderstood the article. Probably because you didn't read it. I do not believe in the Bible. I am not a Christian. Anyways, what does the Quran prove?

Qur’an 18:83-86—"And they ask you about Dhul-Qarnain. Say: “I shall recite to you something of his story.” Verily, We established him in the earth, and We gave him the means of everything. So he followed a way. Until, when he reached the setting place of the sun, he found it setting in a spring of black muddy (or hot) water. And he found near it a people."

Sunan Abu Dawud 3991—Abu Dharr said: "I was sitting behind the Apostle of Allah who was riding a donkey while the sun was setting. He asked: Do you know where this sets? I replied: Allah and his Apostle know best. He said: It sets in a spring of warm water."

Now, does the sun actually set in a muddy puddle each evening?