Doctoral students routinely have their code,data,or ideas stolen. It is a feature of the educational system. Dr's are promoted,protected,tenured by what new ideas they produce and the temptation to steal from from a student is very large, I'm not saying he did, but I'm not saying he didn't. If he did then there are probably more people who have a beef with him.
The code may have been trivial, who knows? Like you know, Flash.