Yes but the parent is referring to gigabit upstream connections. Very few gigabit upstream services are over DOCSIS. I don't know of a single provider that offers gigabit upstream on docsis. In the UK Virgin Media offer 100mbit/sec up on their top tier (1gigabit down). I think the fastest Comcast goes in the US is 200mbit/sec up over docsis and that's only in certain areas.
Maybe I'm wrong but I'm pretty sure cable modems are still wha the vast majority of consumer households have.