Most likely these are real converts. I say that for several reasons, but most of all because the numbers are small. Think about it: We’re really talking about a few dozen people out of THOUSANDS AND THOUSANDS of “migrants”.
It would be interesting to know how many are women and how many are men. That could be telling in some ways.
I know a missionary go Muslims in Southern Europe. He reports significant interest in Christianity.
In many ways ISIS and their comrades are weakening Islam.