It makes no sense to say that they can't open it this year because the crews are furloughed. They decide who is furloughed, so the causation would run the other way. The ride can't open until Christmas or next year, so there is no reason to bring back the crews until closer to that time.
Why would you even bother wasting an opening right now, anyway? Until the parks can return to full capacity, having an opening would be a waste of a marketing event and short term attendance boost. Im sure there are some furloughs with the construction, but Im also guessing the goal of getting it open ASAP isnt really a priority, when it wont really impact attendance/capacity in the near future. Operating it will just be another cost that isnt really getting a return. Its better off, financially and operationally to limp it to completion and mothball it for a year for a better launch window.
I dont think any "new" project will be opening before a full opening and return. It just doesnt make a lot of business sense to that.