I suggest doing some research on python coding with the Revit API. It can seem like a big step but it’s incredibly powerful once you get comfortable with it.
The argument you have to supply is the object in green, IDuplicateTypeNamesHandler. If you click on it it will explain what it does and give you a link to all its members. You’d have to check the members to see how that value is set. You may even have to do this multiple times if the argument is another method that needs defining.