Key to knowing what is going on is understanding the difference between forwarding an “X event”, versus forwarding the result of an X event. See:
What you are seeing is that your host PC does not support “NV-GLX”, and this is unrelated to what the Jetson itself supports. If the Jetson has NV-GLX and the NVIDIA GPU which uses this, but the host PC does not, then you’ll either need to add NV-GLX and a compatible NVIDIA GPU to the host PC, or else use events forwarded from the Jetson which does not use this.
Stated another way: The Jetson’s GPU is not used since you’ve forwarded events which the GPU would render…the PC to which you’ve forward now uses its GPU instead.