The article I linked to makes plain that the the regulatory aspects of the border are a major concern.

Not a concern for UK. The government is adamant we will not have border controls under any circumstances. Good luck to EU if they try it.

If some bigots start throwing their toys out of their prams because they can't dictate who is entitle to freedom of movement and who can't then that's their problem.

Freedom of movement is not an issue. EU citizens will continue to be free to cross any of our borders. It is only the rights they enjoy that may change.

The likelihood, however, is that the government will try to apply a postcode lottery to determine the type of border each person in the UK and coming into the UK will have. If they do, then those who voted for this incompetent government need to be personally held to account by those who are discriminated against.

There is no chance of any of that happening.
These are just made up problems to instil fear.