The Switch OS is actually based on the 3DS one, the Wii U OS is completely original. Thus far installing Wii U titles over the network is not possible, there is no installer that supports installing over network, although it should in theory be possible. Wii U USB Helper Transfer Tool simply stores the received files on the SD and none of the other installers support any networking. Sadly the Wii U never had much interest from developers and there are none still working on it that I know of, they've all moved on to the Switch or other devices, so getting an installer capable of network installs seems unlikely at this point, and without that, Boop can't do much.
Boop works with FBI, which you should have installed as part of the guide you followed. I assume you've hacked your 3DS?