This latest announcement makes zero sense to me physically. The talk about Doppler effect looks like techno-gibberish that makes me wonder what exactly they are hiding and why.
Hamster,
Supposing the orbit of the satellite were ever so slightly inclined to the equator. Then the satellite would appear to nutate North and South of the equator as viewed from earth and would create slight doppler effects at certain times of the day for stations essentially North and South of the satellite. Gotta be something like that.