I reserve the right to change my mind later and haven't heard anything about this except for the words in that tweet, but in a way I can see it being ok. I think it is common for journos to send subjects of their writing a manuscript and ask for comment. Whether "ask for comment" = "additions, changes, tweaks" is definitely debatable.... but I guess I'm saying I can see a path where this isn't as sketchy as it looks. Is it his way of saying "is this all factually correct?"
I'm 99% sure Trump is given the opportunity to consume woodwards manuscripts and whatnot and asked for comment before they go out. I think Michael Wolff said the same him his books too. So maybe is similar to that but his word usage wasn't ideal?
Or it's sketch AF, obviously totally possible.