Except it's also an issue in Germany and I'm sure they have reported it in the past. So Brexit not being the sole cause was a given. It was also not intended as a news report, to comprehensively portrait an issue, but an opinion piece: you can see the "Meinung" (=opinion) watermark in the top left. It's a "told you so" commentary about how the Brits didn't value the support that freedom of movement, with its cheap Eastern European workers, gave to their economy and how they now have to call in the army to help, usually the mark of a state of emergency or failing state.