Why were only 5 runs awarded after wide ball flew over batter, keeper and ropes in Canada Super60?

Pacer Ali Khan bowled a bouncer that sailed over Kieron Pollard and the wicketkeeper before clearing the boundary on the full in Canada Super60 semi-final. Toronto Sixers were awarded five wides, not six or seven. Under MCC Law 19.7, a six is scored only if the ball is struck by the bat. An unhit boundary counts four, plus one wide.