For the record, I'm not sure how much I believe this report. The Rangers tend to be pretty tight-lipped about things like this, and when they DO leak, it's usually through Larry Brooks. That would seem to indicate that this leak came from a non-Rangers source. The most likely source that would benefit from the rest of the league thinking that the Rangers (and their full cupboard of prospects) were "all in" on Miller? Vancouver. I wouldn't be shocked at all if Vancouver leaked this out in the hopes that it would raise the offers from teams who are actually interested in Miller.
He just doesn't make sense for the Rangers in the same way that Hertl doesn't. Why pay first line center prices for a guy who would be playing on your third line* and only getting 2nd PP time? The Rangers need either a gritty, shoot-first RW, OR a gritty 3rd line center who can win faceoffs.
* Kreider-Zibanejad and Panarin-Strome have been together for literally years. They aren't breaking those tandems up, so whoever they bring in will be on the 3rd line.