> You must absolutely not use the default pool.ntp.org zone names as the default configuration in your application or appliance.
- http://www.pool.ntp.org/en/vendors.html#vendor-zone
Hopefully they were just unaware of the vendor zone policy.
It seems they didn't know, or didn't care, how both the third party iOS library they used and the NTP worked, see my other posts here.
They surely didn't need ntp.org pool at all.