Though the headline still stands… in the event of an entirely avoidable ‘No Deal’ Brexit, the default position for UK citizens seeking to visit France is that they are likely to need a visa and that UK citizens living in France will need to apply, and qualify, for a carte de sejour.
Hardly reassuring?
Just also noticed that the article you linked to is in French. Of course if one lives in France one might be expected to be able to read French but not everyone can and that can hardly be expected of tourists?