Right - I included the bottom line on trade. There's plenty more context in the article, and only a small sliver is at all good for the Brexiteer. Everyone agrees it's been between 6-30% worse on the trade front, and the OBR estimate is middle-of-the-road in that regard.
"Would be a run on the pound" is forecasting, just like expecting that Brexit will eventually be neutral or slightly positive. The article reports agreement on past/present facts.
The obr is not the only source here, but one among many.
You seem very invested in ignoring evidence that before wasn't a great idea. This suggests you're more interested in ideology than evidence-based reasoning. It's distressing that "free thinking" has become an excuse to ignore evidence and pursue vibes-based policy.
Enjoy the kool-aid.