No, that isn't the policy at all. The government target is to achieve Zero Carbon Homes, not Code Level 6. A Code Level 6 home must be a Zero Carbon Home, but a Zero Carbon home does not always mean Code Level 6.
Within the definition of a Zero Carbon Home http://www.zerocarbonhub.org/definition.aspx it explains this.
The energy element of a Code Level 6 home might be the same as the 2016 Zero Carbon Definition - or it may be a gold standard (i.e different). This will be out to consultation later this year I understand.
It is important to differentiate between Code Level 6 and Zero Carbon because achieving the whole Code (including Water Efficiency, Materials, Correct Daylighting) become massively expensive - on top of achieving Zero Carbon.
You are basically making it sound more expensive than it actually is and creating unnecessary concern.
You are right things are changing, but the 2016 policy never has (and I doubt never will) be about achieving full Code Level 6.