So you don't. I thought so.
Has anyone been able to find any cites of hard Brexit or soft Brexit from before the referendum using the terms in the same context they've been used since remain lost?
I hope someone can, but I haven't been able to. To give you the incentive to prove me wrong, I'll make the following claim.
I claim that the terms hard Brexit and soft Brexit were invented by remainers after they lost the referendum, and I cite the whole web as evidence.
I genuinely expect to be proved wrong in that claim, but I'm interested to discover who first coined the terms, and when.