Having extra pads for power kinda makes sense, but I wonder why they have dual I/O lines.
In general, number of pads doesn't have to match the number of pins. One could use a power interposer with one ruddy wire to the pin and many thinner wires to the pads.
Maybe they were given a choice: QFN before New Year or TO-220 after New Year. Example custom packaging from the same site:
http://www.psitechnologies.com/products/custom-packages.phpAs far as dual I/O: maybe they used some ready-made serial I/O blocks that operate in a dual ring, sort of like FDDI? There are pins named "bypass", which kinda suggests ring topology interconnect.