It certainly looks like a false statement.
It's fair enough when they word things carefully that might be interpreted to be what people 'want' to hear. Maybe that's what they're doing here - perhaps we are understanding this to mean an 'enterprise' grade drive such as the WD RE4.
I assume the hard drives in the Mac Mini Server are 2.5" drives - and no doubt they're not enterprise grade drives.
Even if the statement might not be legally wrong, it's certainly very misleading. I wonder what Apple would consider a non-server grade drive to be?