It's not a problem for everyone, so it's not a problem with the discs. And they were able to reproduce player settings causing the problem to appear.
It sounds like a well-reasoned evaluation of the situation, not "a load of crap".
It "might not be a problem for everyone", but that doesn't mean there isn't a problem. Loads of people, even on this forum, hadn't noticed the audio problems on EaF because they don't have a home cinema set and are just listening on their tv speakers. The problem should still be audible then, but most people don't hear it and don't care. I think a small audio synch problem on the extras goes unnoticed by a lot of people. Doesn't mean it isn't there.
And even if it is true that some players have synch issues and others don't, CBS should've made sure that NO players had synch issues.