Though never having personally tasted it, I'm sure that Yuzuquat would be edible, including the peel. In fact I find the peel of Yuzu to be pretty edible and relatively soft and not too bitter. However, I question what the practical use would be. Although it is not impossible, most people would probably not want to forage on Yuzu fruits eating them out of hand. Rather the peel is useful for culinary purposes, adding flavor, or I'm sure you could candy the peel for a snack if you wanted to. What would the point be? A slightly more cold tolerant version of kumquat?
If you have a Yuzuquat, you cannot just pop them into your mouth because they have seeds. So are you going to cut open the fruit, remove all those seeds, and then eat the fruit in segments with the peel? I guess it is possible but I cannot imagine most people doing that.