People are always asked by the media to explain why they're making people redundant, and at the moment, of course, Brexit is one of the main things they can blame. Brexit uncertainty probably really is having an effect, and even if it isn't the people claiming that it is might honestly believe that to be the case. If the referendum losers had accepted the result then that uncertainty would have been eliminated, so they must carry a lot of the blame for dragging out the uncertainty to the present and beyond.
If Brexit wasn't happening then there would be something else to blame: the downturn in the global car market, Trump's policies on tariffs, Climate change, or whatever.