Sure, and that's why they pulled out. There's no bad actor here.
They made a reasonable request considering how they wanted to structure their deal, it was declined, and they pulled out, as was their right.
The NHL declined the request, for as you state, reasonable reasons, and accepted Remington withdrawing.
It's just unfortunate for this city, because it feels like a downtown rink isn't really all that close to being on the horizon, even with new ownership. The situation leads me to be believe that the Remington Group was 100% committed to moving the team DT, and quickly. The other groups are not. They're willing to wait and see how it all plays out after they buy the team. Doesn't mean they won't be good owners, but their bid doesn't hinge on the real estate.
It also leads me to believe that the NHL is skeptical about Lebreton and the NCC, otherwise they probably would have granted to negotiating window. Seems like they feel that the risk of the deal falling apart are high, so they're willing to accept a lower, but non-conditional, bid.
The last thing the NHL or Melnyk family wants is to restart this process if negotiations with the city/NCC go south, and they must think there's a good chance of that happening if they're passing on a, reported, $1B+ offer.
Also, prepare yourself for the pointing and laughing at Ottawa fans and media from other fanbases when the final sale price is quite a bit less than what's been reported and lacks celebrities. "You guys really thought the Senators were worth $1B!?!?"