He actually contradicted his IDA CEO who claimed that others had already done it but could not provide any examples. His CSA chief in his first press interview claimed "billions' of attack and now for some magical reason presumably as result of PM stating that it has not be explained well is now claiming that 16 cases of breaching the firewall. What is also interesting is the new claim that MTI system was separated in 2010. I think we are looking at semantics in play.
GE - General Electric, one of the oldest listed companies in the World and certainly one of the most respected has all its employees in a single email system and they have access to the Internet. The guy builds the engine for the Apache, to the guy works for GE Capital are all in the same system. They handle many highly classified work for various government including top secret engineering works around the World.
The growing suspicion is that someone at the top of the house was personally negligent resulting in a serious breech and to portray that it can happen to anyone has now pushed for this solution as the "get out jail " card.
Air gap system are nothing new. It has been part of the security and risk based approach and used in the military, nuclear plants, water chlorination systems for reservoirs etc Even some cars that use computers do not allow remote diagnostic to avoid stray and rogue signals fiddling them. But separating the entire system shows with inability to handle or running someone's personal agenda.
Yaccob is also an idiot. Obviously this is big news around the world and he and the others are going to field a lot of queries from their counterparts. People naturally are going to be courteous and diplomatic even though they might think it is poor solution. They obviously going to blow warn air up his arse rather than ask him if Singapore cannot handle their security.
If Singapore decides as a policy that anyone ill above the age of 75 cannot be allowed to be resuscitated by any medical doctor to save on limited resources, Gan Kim Yong will also be fielding calls from his counterparts from across the World. The majority will be polite and want to know how they are going to implement the policy.