No matter how you try to cut it, it's an endorsement of the NDP and it's conslusive just in the fact that the contrary side was decisively less. Those who stayed home could be reasonably considered to be happy with the status quo government in power.
I believe one of the biggest factors for the NDP majority win is that the heart has been ripped out of the political right because of US politics of madness!
Those who stayed home were happy with the status quo which was a minority, they didn't want an election.