They'll have to make devices like this so users can use what they already have, and current products at the time of LP's release could be used as well.
If they didn't, users would get upset having to replace existing equipment, and products would have to wait for the next revision in order to add an LP chip to the design. Both would negatively affect profits and the adoption rate.
Clunky, clumsy, whatever, it will be better for them to go with devices like this so users can take advantage of the tech with what they already have. Wet their appetite as it were, and once the LP equiped products release, they'll be more willing to buy.
It uses protocol translation (software) on the system side (send to a device), and a bridge chip to convert the original protocol into an LP signal (device to LP port in the system).
Since LP uses a Quality of Service (QoS) implementation, it has a protocol as well (not just hardware), so the way they've advertised it isn't actually correct (no matter how simple an implementation it may be).