if they are just going to use the 2nd half of the original stage tomorrow (distance would fit), it may actually lead to a more interesting day than planed. The big climb was likely to be ridden at slow pace anyway before, but with everyone fresh, it could be a different story.
It's Oman, everyone is fresh no matter the distance. They ride like 150W before the last km every day. It's basically the same stage.
EDIT: even worse than I thought, today the smaller guys did between 130 and 140W before the last 5km lmao. When someone asks "would you be able to follow the pro peloton" the answer is always "yes in Oman".