>The precision of outages (at :29 and :44) matches a network-synchronized clock (NTP).
I think this just correctly points out that if the trigger was something unsynchronized like animals chewing on wires or someone digging underground, you wouldn't have 61% of events occurring at these two second markers. Even if the trigger was something digital but on a machine that isn't NTP synchronized, you would eventually have enough clock drift to move the events to other seconds. 61% combined at two markers (exactly 15 seconds apart) strongly suggests synchronized time.