It’s the 2 miles to work which is the clincher.
Ask him how long it takes to drive in the traffic, park up, get into the office, etc.
Then ask him to walk one day a week. He can get a taxi or a lift back if necessary. Or start by driving there, walking home, and walking in the next day.
It’ll only take an extra 30 mins a day, if that.
Non-walkers find the idea of walking a couple of miles difficult to understand; there’s a blockage saying "If it’s a driving distance, I couldn’t possibly walk it", so it may be a good idea for him to walk the equivalent with the family one weekend.
And suggest his wife (assuming she is the cook, or shopper) prepares more salads for him to reduce his calorie count while filling him up.