The decision to do this was made before June 2018, 18 months after the last activity. One of the reasons cited was lack of activity, but that is no thanks to them, I guess.
That is why I am convinced the goal was to replace it from the onset, there was no interest in helping out the project. In fact "no activity" was the right excuse to make their action seem legitimate. Attempting to contact the project could have jeopardized that plan.
They could have just removed "dstat" from the distribution, and added a note that users can now use pcp-dstat. But now they made it impossible for users to add the original dstat. Let alone the support nightmare of having a different tool with the same name. There's no winning this one.