Reading that note again (it was a download from Flightsim.to), I think it confirms that the only indication of CG is literally on the “not in reality” MSFS toolbar.
Thinking back to flying the Citation Encore in real life, I don’t recall needing or using the CG beyond ensuring the aircraft was loaded properly and remained within the envelope as fuel was burned.
In the Encore, we didn’t set a specific trim for the CG that I recall. In the Longitude, it appears that you do.
In reality, I guess you’d come aboard with your paper Weight and Balance. Or, now that we’re out of the Stone Age, with an Ipad app that you’d have used to do the math in a tenth of the time.
In the sim, it looks like the only way to do it is to access the toolbar weight screen.
FWIW, even in the 73/320 we either get the ZFW CG uploaded or enter it off our flight plan.