No, I never said there was no present service from the Fort to MK. I questioned your statement that it was to the Outpost, that it's always been there, and the implication that it's regular full-time service.
I'm certain that if the route existed when I was trained for the Fort internal shuttle years ago, I would have been told about it, rather than making Guests change buses twice to go to WL and then MK. At the time I trained for MK, new drivers were trained on all routes based at the hub (I know that procedure changed over the years.) I drove the route between MK & WL many times, and the only time it went to the Fort at that time was when the boats were not running.
I have no 1st-hand knowledge of current routes, other than my recent experience traveling from WL to MK. I was told by a driver at FtW about a year ago that MK service started at 4 p.m. That was reinforced by the driver on my recent trip, though he was less specific. I've also seen it stated numerous times on the web. There have also been reports of special buses running to MK at the end of Hoop De Doo, or directly to resorts when HDDR ended after MK close. The official map I linked in my previous post tells Guests to take the boat to MK, which wouldn't make sense if there were a full-time bus to MK at the time the map was printed, although I recognize that Disney often edits info distributed to Guests to reduce confusion, and for "business purposes".
Now, as I said, it's possible that service was expanded to full-time within recent times, but I am confident that it did not exist 5-12 years ago, unless it was some sort of covert operation that was hidden from Guests and drivers.
I suggest you check with your coordinators at MK bus ops or with some senior drivers, as you may be giving out incorrect info in your classes. (Bus managers may not have past knowledge unless they came up through bus ops.) You said you teach at Disney U, so I assume you deal with the general cm population, not Transportation cm's specifically. As you probably know, cm's outside of Transportation are notorious for giving out incorrect transportation info, so it's important that they are given accurate info.