"20Mbps is not broadband according to the FCC"
And what would Vodafone or the rest of the world care? The FCC do a bad job of regulating US telcos and Vodafone have no meaningful US presence since the sale of their Verizon stake.
To a large extent Vodafone are right when they talk about the bandwidth demand of mobile devices, and even for fixed line, most of the world aren't seeing anything like 20 Mbps.