The owner claims Romney and his staff were welcome to eat there. IOW, they were not denied service. The restaurant somehow got the impression that Romney wanted to make the stop something in the nature of a campaign event - press, make remarks, etc., and that is what the owner turned down. It's a "fellow Mormon," so Romney probably thought there would be a bond that supported the lending of a helping hand.
The resturant owner is spinning in the aftermath of a stupid and insulting decision to deny service to Repubicans. That’s okay if he thinks he’s in an election of some sort. Dems do it all the time and often end up regreting it.