Although I have no interest in attending this concert (I saw the original production six times, with different casts, and several productions since; the first original cast is still by far the benchmark for me, and no subsequent production has come close to that one [for me]); I do have this to say about "concert productions:"
You'll see these, and to many it's immediately obvious who did their homework as soon as they got the offer. These are the people who hired a coach, or just had the help of friends, to dig in and explore the dialogue and music, make specific choices, and memorize the piece. And there are those who just showed up at rehearsal, expecting to be taught what to do.
There will always be a difference of opinion on nose in the book performances; some people enjoy them; personally, I think if you don't really know the material, you're flying half-blind. That can be interesting, in a hit-or-miss way, but to me it just can't compare to what comes from someone who has done the work - whether that work was done in guided rehearsal or independently.
What's odd about this particular case is some viewers here report nose in the book performances, while others report fully fleshed out ones. I wonder what's really happening?