Okay so, apparently on Open Table you can reserve dinner after 5pm, even though the park & restaurant closes at 5?
also it looks like they will be extending into dinner hours soon. Dinner is now listed on MDE. It wasn’t earlier this week.
Are you sure you are looking at the right Yak and Yeti?
I don't think you can actually book on opentable, have to call restaurant instead and they book for you.