Causing a brief outage in only iOS 6 and OSX 10.8 sounds like a great way to boost the iOS 7 and Mavericks adoption rate. Just sayin...
I doubt they intentionally caused it.
The article notes that 6.1.6 is fine but not a way earlier version. One key thing with 6.1.6 was that it repaired that serious SSL bug. A bug that might be in that older version. It's possible that not patching that bug is the real issue. Or simply some other bug that wasn't fixed by upgrading along the way that might be fine if you had any other 6.1 version