they didn't use his solution. they began to adopt his approach. began to. they are still not even close to done with it all, and the changes they would need to make to fully line up with Casey's approach can't happen because of other things the code does.

they were not caught using his solution. they published a blog entry describing that they were made aware of performance problems and they didn't mention him. it was rabid fans of Casey that started foaming at the mouth then, even though Casey publicly stated he didn't want or need credit, because the idea wasn't his to begin with.