All he would have to do is turn the trigger back on (that's a simple matter of flipping a single flag, by the way), and it would perma-crash, because the methodology he is using to generate the crash would catch too many false-positives.
Well, now that I think about it, they wouldn't be 'false'-positives, they would be another mod adding recipes for an item which has a recipe in Gtech, which is what his real problem is. Even accidentally leaving on configuration settings that permitted multiple recipes for the same item (such as MPS enabling 'basic' as well as Gtech' recipe settings simultaneously) would trigger the crash. It would make the game completely unplayable with Gtech if he left the trigger on.
However, by not removing the code, he's made it clear that he can and will enable it at any time he feels like making a point. Which means he is planning ahead on crashing the game at a later date.
Think about that a moment. He is deliberately leaving the code in because he expects that he will want to crash your game at a later time. I don't know about you, but I have all kinds of problems with that.