It actually is 
But because of the known Hyper-V problems, they promised to update at least the docker running in the virtual box for quite a longer time. The toolbox itself won’t get any updates though. Which I find a bit pitty, I really love the GUI (kitematic), it makes accessing logs so easy.
I can’t find the deprecation announcement, nor the promise to update right now. The repository seems to be staled and only bumping versions of docker.
