Wow. That's another one of those articles (and documentations), which requires you to be immersed deeply (part of some cult?) in order to just understand the first thing. Not a good way to get new developers into using your framework. Also, they seem to value 1:1 (hidden) conversation over public discussions. Well. I skipped the article and went to the GitHub repo. There it reads that
The Higher Order Programming Environment is an architectural template for implementing end-user processes as finite automata (FA) in a distributed computing space.
So I think that it's just an abstraction over a finite state machine, which you can scale on distributed systems. It uses a lot of fancy terms, and seems overly complicated for just that, so I personally wouldn't touch it.
I may be completely wrong though. Hard to say. You might want to try writing an issue asking them to explain what HOPE does "like I was 5". It's a question they need to come back to Earth, imho :)