I think that comment was more of a joke than an actual suggestion. Hiding the zoom binding from controls is unfortunately not a simple tweak, unless you're looking to delete the zoom feature altogether.
The zoom keybind shows up in Minecraft's controls menu due to a limitation in Wurst's keybind system - it can't create a keybind that's only active as long as the key is held down. That's why the zoom button is a Minecraft keybind instead of a Wurst one.
Addressing this issue without breaking the zoom feature would require an overhaul of Wurst's keybind system, so that it could properly support this type of keybind. At the moment, I'm already working on something else, but if anyone wants to dig into this and submit a pull request, they are more than welcome!