Okay, yes, but that's because they had messed up their application enough that the updater itself couldn't be updated, which they presumably discovered in the process of trying to remedy his bug. That is, the flaw he found couldn't actually be exploited only because of a deeper flaw he hadn't found. (Shades of the Sirius Cybernetics Corporation there, whose deep fundamental design flaws were almost totally hidden by their superficial design flaws.) He still led them to a critical vulnerability that took them months to fix.