This just means it's Source Available to certain customers - Closed Source to others.
I agree that universally available "timebomb open source" "Source Available" is different from "Closed Source", though.
It allows for certain risk planning, like: If HashiCorp goes away, we will be able to host and patch (and keep using) product X for the foreseeable future - along with the ability to actually read the code and determine if it is something worth touching with a ten foot pole...
Which, of course, is obviously false. Which means the words have different meaning than what you ascribe to them.
Source available means you can view the source code, by abiding to the terms the owner of the code sets.
Closed source means you can’t change or redistribute that source, regardless of whether you are allowed to view it.
