Well yes they are.
Norway plus doesn't give leavers what they wanted and for remainers who want to see the UK as a full member of the EU, it doesn't give them what they want either.
It leaves the UK as a rule taker. As I said, worst of all worlds.
I suspect the reason so many MP's are keen on it is because they see it as a way back into the EU. I think they hope that people will eventually decide that since we aren't getting any of the benefits of leaving, we might as well be in the EU.