Again, not true. You, as usual, are oversimplifying and consequently missing the point. The public service carries out the business required for the ongoing operation of the country and it continues to do so long after any elected government is voted out just as it did long before they were voted in. It and not the elected government is the employer and it and not the elected government has the right to expect compliance with the rules and policies it develops. The elected government, like a board of directors, sets policy objectives and budget priorities for the public service, but it does not employ public servants and has no authority to command support from them.
Public servants are required to follow the rules and policies of the agency they work for and that may mean refraining from public criticism of those policies. They cannot, however, be required to support the elected government as is being ordered. It is Harper's government that is playing with semantics by phrasing their demand in such terms and is just one more overreach of it's authority. It is you that have accepted that demand as legitimate without giving more than a passing thought to what it means, and it is because of people who take your approach that we are saddled with this government.