Just trying to consider the facts/info we do know:
The relative in the interview above said Hassan didn’t or couldn’t ride the other coasters in the park. He didn’t confirm whose decision that was but he did say Hassan tried to ride.
He also said his niece, who was sat next to him said he passed out mid way through the ride, before the restraint was unlocked. This fits with him being ejected at the end of the ride, not nearer the beginning.
This interview with people behind him on the train suggest there was an issue with the restraint not locking properly in the station -
https://www.instagram.com/reel/DecHj4Cj7LJ/?rpxt=N3VhbWI1bDNlaHV5 - they said he said it keeps clicking weird, locking and unlocking, locking and unlocking.
The relative confirmed it was Hassan’s first ride on Goliath. Even if he was interested in roller coasters, it doesn’t appear that he would be the type of die hard enthusiast to try and leave space between him and the restraint. Maybe that is just my opinion. But the restraint certainly looks too far open for a train to leave the station in the onride photo. It looks like it’s opened at least somewhat compared to when he left the station, and that would fit what his niece also said.
To me this is starting to look like a perfect storm, where multiple factors have all aligned in a freak tragedy. A potential faulty restraint (we don’t know whether that’s due to design, maintenance or operator error or all of the above) and potentially someone who shouldn’t have been riding due to illness, medical condition, body type etc. While I don’t think the passing out is the cause, as a restraint should still hold someone in despite that, i doubt that it’s a complete coincidence.