That is not incorrect.
Well, XLR metal housing are already connected to ground with the rack case. Why connect them again to main ground cable and not pin 1 of XLR ?
That is incorrect. Do you mean Pin is not connected at all?
Yes, as you can see on pictures I posted, the main grounding wire is only connected to input xlr metal housing, not pin1 of the XLR.
Do you mean tehre is no galvanic connection between the shield and ground, or do you mean the case is not connected?
The upper shield cap is not connected, not soldered, just put down on the transformators. There's no connection between the base (who's connected to ground and the upper cap.