I think that’s a good read on background subtext that’s already there - at least it’s what I inferred from watching the theatricals. I agree that TLJ is the weak link in the chain in this regard, however, I don’t think any of the actual events onscreen are the issue - it’s the crawl, which (I think accidentally) implies they’ve bum-rushed everywhere at once and overwhelmed the Galaxy (despite the fact that we can see the core of their remaining forces, which are chasing down a small handful of ships that keep outrunning them). I always interpreted the First Order as a military junta, so I changed the first paragraph of the crawl to spell it out:

The FIRST ORDER reigns. The New Republic has been decimated, and in this state of galactic confusion, Supreme Leader Snoke’s armies have seized key territories and taken military control of the galaxy.