It's aspirational. Amsterdam, which now seems like a cycling utopia, had a cycling modeshare not too different from the US until the 1970s, when citizen outcry about motor vehicle deaths prompted major policy changes, which resulted both in drastically improved cycling infrastructure and disincentives to the owning of cars (taxes, etc.). Now cycling modeshare there is about 30%, but the infrastructure and policy came first, and the modeshare followed. DC ostensibly has a goal of increasing bike/ped/transit combined modeshare to 75%, and the way to accomplish that will be improvements to the infrastructure and service for all three, after which (hopefully) more people use them instead of driving.

I haven't been particularly impressed with Vision Zero stuff so far, but "[t]he entire D.C. transportation policy" as being about bikes is disingenuous: they've also added dedicated bus lanes, new crosswalks, leading pedestrian signals at existing crosswalks, traffic calming measures that increase pedestrian safety by reducing car speeds, etc., etc.