No. The Intel Retimer handles two ports. Apple is just using them in a mode that likely indicates will just change the traces when go to a four port model upgrades on the MBP 13" and probably "best, better" Mini varaints (that don't backslide on ports).
Apple has a four port controller embedded. They just aren't using it "all" inside or at the retimers.
Intel themselves says it’s a single port.