You are not blind, I believe the versioning is still mentioned in places but I’m not aware (at least in the Public Data API) it is in practice functional. As you say - some of the machinery appears to be in place.
I haven’t seen any official Companies House information either way on this (you can try searching this forum) however.
See e.g. thread touching on this from 2018:
It would be good to have official notice from Companies House on this though!