Looking at the video I'd say it was a foul. The keeper made a right meal of it after the foul had been given though - suddenly writhing around, presumably in an attempt to get Simpson booked.Brave Sir Paul dares to disagree with Pate
https://www.dunstabletoday.co.uk/sport/football/hatters/tisdale-felt-exeter-s-disallowed-goal-should-have-stood-1-8365387