This is simply done so that an neither Westjet nor a foreign shareholder (institutional or private) would not have to file any reports for holding more than 789,303 shares of Westjet (0.588%) because variable voting shares are a voting share class that only has 7,893,039 shares in that class out of a total of 134,223,690 (all counts as of Q2 report). This does not change any of the rules for reporting takeovers other than treating all the shares as if they were common shares so that foreign holders only have to  holdings reported equal to 10% of the float of all shares, and Canadian holders the same.