Yellowhammer is not a fact it's a worst case no deal scenario. Most people of average intelligence can grasp that for those with low intelligence sadly not the case
So according how many scenarios for no deal there can be? You can have a lot of scenarios for the type of deal you'll negotiate, but a no deal is quite straight forward, but you can keep on hoping, this is what you've done for 3 years.
And btw, why hasn't your government published the best scenario for no deal, ask yourself that question, you might see the light