The recipe refers to coconut milk and cream, but there is no cream in the recipe. Is this an omission?

Yes, Benny is correct. The heavy cream (and everything below it) are for the topping.

If you're wondering where the cream in step 2 comes from -- that comes from the top of the can of coconut milk. When you open a can of coconut milk, you will see a layer of solid cream on top and under that is liquid coconut milk. Separate these two things and you'll have a little less than a cup of each.

The cream is mentioned in step 4. its whipped with sugar for a whipped cream topping.