In my opinion, this “Super Heavy” concept is something that Elon is simply saying is theoretically possible but will not happen. It would require significant engineering resources, another redesign of the center core to handle the additional stresses, and a major redesign of the TEL. In addition, it would likely not be able to be assembled horizontally which is the way SpaceX assembles the F9 and FH.
So it’s not going to happen. The BFR will be more capable and more cost effective than this imaginary FSH.