The thing is Ruby
There is no precedent of the EU "expelling citizens". In reality it won't happen, not least because we have been lying for it for 40'years.
They won't expel the country with the most oil and gas in the EU
Nor will they expel the country with the 25% of Europes renewable energy resource.
On top of that they wont expel Scotland because,,according to OECD figures it will be the 6th wealthiest country in the world, substantially ahead of the UK in 17th and ergo a contributor to the EU budget.
Now, if you were Angela Merkel, who pretty much owns the Eurozone, you would be pleased to see Scotland stay. You know, to help with the cash flow. Spain on the other hand can try and object in a bid to arrest Catalonian ambitions, but we all know Angela Merkel owns Spain, Greece etc. they will be doing as they are told. Else, no more bail outs.
So the link you quoted is a perfect example of the state or the establishment trying to flex its muscle to scare and intimidate without any real foundation, in a bid to influence and control through fear.
Anyone heard of the McCrone Report?