Grapel is studying law in the US, and his father is paying for it, so he knows. During summers, US law students go on internships. So far, it all makes sense and no rubbish. Why Grapel chose to go to Egypt I don't know, but his claim is that he likes Arabic culture and has been to Egypt a few times already. This is also plausible.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Egypt extends detention of alleged Israeli spy Ilan Grapel