You are right... it is not necessary... I added because of the docstring, where you explicit says that you have to register all the transformer, and to make it consistent with the register in the reveal exporter where you defined the _register_transformer to add the RevealHelpTransformer and you also include the super() call.
You know more about this... so if you think is appropriate to delete it, just let me know and I will update this PR erasing this part of the code.