And you don't appear to have thought out what the practical impact is. They will still have to negotiate a deal and it is not going to be any different to the deal that May got because they are taking exactly the same approach. Stick head in sand, delay, hope something changes.
Tory party policy is deal. They have never suggested anything otherwise. What people are confusing is the strategy and the deal. The strategy is to, attempt to, resolve the constant crisis and delay. Part of this involves accepting that the EU has red lines that they won't shift on.