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First, musk is an ass. No defense of him.
Spaceflight, however, is awesome.
I'm just an enthusiast so I trust your professional opinion more than my own knowledge.
I'm assuming your referring to the SpaceX on-orbit refueling of cryogenic propellants requirement, which I agree hasn't happened yet in history by anyone. However, there is a regular on-orbit refueling of cryogenic propellants for years on a regular basis with Progress spacecraft refueling the 400 liters worth of tanks (860kg of hydrazine) on the ISS for its orbit raising rocket engine located on the Zvezda module of the ISS. Cryogenic propellants would be a whole different animal however.
As this technology is in regular use in space today, I don't doubt SpaceX could do this, but we agree this doesn't accomplish anything close to what is needed for the lunar mission SpaceX signed up for.
Don't forget ESA's ATV and the NASA RRM for refuelling the ISS. As was the case with launchers for a while, the Europeans and the Americans have beautiful, expensive and awesome solutions, while the Russians just get the job done (often by waiving safety standards)
Anyway, the ISS is a different beast, it's in LEO and it didn't need to be launched in one go, so you can send up heavy equipment and integrate it on-orbit, activities which require Gantt charts so autistic that my eyes bleed when I think about them. Starship-to-Starship refuelling would mean sending a single spacecraft up with all the necessary equipment to do propellant transfer, which is what I was thinking of when I wrote my comment, as you say.