... while all the negative forecast of the stay camp in case of Brexit are starting to occur already?
... do we still call "populist" the mention of a real issue. I don't think we do.
You mean the market drop? One-day drop? Today, the markets are recovering. Does that vindicate the Leave side? Or simply illustrates that markets tend to go up or down on any given day, and that overreactions tend to correct itself over time?
As for "populist"... Immigration is a real issue. Does mentioning it counts as "populist"?
Once again, racism, bigotry, populism are simply labels one side slaps on another in absence of better arguments.