This makes no sense. I am sure it is just a mistake or they are out of stock on the UMC. That is a critical thing for them to sell.
I could see them decommissioning the Corded Mobile Connector, though it still has a purpose - it is the only thing that lets you use a NEMA 14-50 to its fullest. I wish they would sell it for like $400. At that point it would be a good solution for a lot of folks to be their "keep at home" unit while using the UMC Gen 2 that comes with the new cars in the car.