I have the XI Formula, which is mostly the same as your XI Code. My fans work fine on the AIO and W_PUMP headers. If you're controlling them by Q-Fan in UEFI Setup, everything works as expected.
There are limitations if you use AI Suite (Fan Xpert 4) in Windows: You can manually set the performance curve for AIO/W_PUMP headers, but none of the other fan configuration options are available (auto-tuning, temp source, fan location, RPM Fix Mode, auto stop, etc.)