mirza ghulam ahmad

Q: I need a clarification about the commentary of Holy Quran I downloaded online. The commentary was trying to describe the importance of Surat Al-fatiha and it made mention of one Ahmadiyyah Movement in the name of Hazrat Mirza Ghulam Ahmad saying he claimed to have fulfilled the prophecy relating to the second advent of Jesus by holding in his hands the little chapter, Al-Fatiha relating it to revelation in the New Testament prophecy precisely Rev. 10:1-2. I just want to confirm the authenticity of this commentary before I continue reading. I am very cautious of Islamic materials I read. I just to you, sheik to confirm or explain more about the commentary relating it to Hazrat Mirza Ghulam Ahmad.