That is nice to hear. Many people have indicated that Islam's condemnation of terrorism would be better received if they put their money where their mouths are, so to speak.
Good to see that this young man is doing just that!
Most possible this guy never read Quran to understand what it says. When I was a kid, I used to read quran in Arabic but never was motivated to investigate and interpret what each Sura means. Until, I understood the meanings of these Sura, I also thought Islam is gooood!!! Fortunate, I put my lethargic brain to some work. I no more believe in what I believed and started, since when I turned 22 yrs, believing in what I didn't believe prior to 22 yrs of age.