Our definition of “last mile” is essentially that where a high-capacity pipe comes into a town and terminates in a building or something, anything that goes from there to the household, whether it's via fibre, cable, or wireless, is all considered “last mile”.
If I can give an analogy, the backbone is the highway and the off-ramps, and the last mile is the surface streets. It's typically anything that connects the households to the backbone.