Er, and how does that in any way say anything more than "we use it in the Xserves as well"?
That's the thing Abstract (and others – at least me) have against that argument. "How about naming some other manufacturers, instead of just naming Apple's own products, as naming just another Apple-product isn't a valid argument?
Your link just mentions Apple's Xserves. Just like it did the last time it was linked to.
Because it's known that a 1M hour MBTF is server/enterprise-grade. While it seems a huge mistake if Chulani lying about his blatant comment, it's also odd for that Hitachi has not made mention of this rating themselves.
Since these drives were obviously going to displayed as soon the Time Capsule was available it's possible that Seagate bid for 1TB position in Time Capsule and decided to make use a "beefed-up" Deskstar that met the minimum classification of server/enterprise-grade. Offering a more reliable drive to consumers while cutting corners.
The 500GB Seagate Barracuda ES found in the cheaper TimeCapsule is advertised as Server/Enterpirse-grade on Seagate's website with a MBTFs of 1.2M hours. It also has the standard 5-year warranty for these class drives.