While the tone is incorrect, the poster does have a point. "/System" is copy-protected for a reason and a future update from Apple may freely "smash" /System/Library/QuickTime during an upgrade, etc. and it is bad mojo for people to be messing around with the /System.
If /Library/QuickTime works just as well, maybe you should use that (QuicktTime already downloads a lot of components to there already). I noticed some applications don't obey the hierarchy and may not load the components, so it may not work. If you try, what was the verdict Derrick? (I don't have any Ogg files to test myself.)
Another note is that the poster forgot to mention "/Network/Library" is also in the hierarchy.