That article also says:

The new sandwiches became available Tuesday, though customers can still make substitutions or create their own sandwiches.

If you walked into a store and ordered the classic black forest ham, by default it basically comes plain and you’re expected to pick out your own preferred toppings. But if you go in and order the new grand slam ham instead, it by default comes with a reasonable set of default toppings. You’re still allowed to customize but now a lot of people won’t need to.

And all this is moot for online ordering since the website does include default toppings for the classic sandwiches.