Does pork and coke really make worms and maggots?

You really don't need the cola for the maggots to grow on pork meat. You can go to the extreme to see the magotts when the swine is still alive.

No. Maggots are the larval forms of flies. If you leave pork or any other meat out where flies can land on it, and leave it there long enough, you will get maggots.