Ideally. Because fresh cooked rice clump together and just generally makes more of a mess than a good dish when doing it like this. However, if you don't have any leftover rice, you can cook a fresh batch, spread it out on a baking sheet and dry them out a bit in the oven before proceeding with making them into fried rice. If you fry them fresh they contain too much moisture, so that's what you need to correct if you use fresh rather than day old.
The macros here are incorrect, by the way. I used all of the ingredients listed, and the weight proportions per serving. 677 cal per burrito and less than 50g of protein per serving.
You lie about the calories on all your recipes. This benefits nobody and will affect people in the long run if they don't weigh their ingredients and blindly trust you. There was another burrito video I replied to that you made that had the exact same problem, and at this point I'm starting to think you're doing it on purpose. Do better dude.
Buffalo sauce is just hot sauce and butter. Why would you add buffalo sauce, that already has butter in it, to butter. Just use your fave hot sauce and make it from scratch if you're going to go through all that effort.
Depends on the buffalo sauce you use. For example, franks redhot has the wing sauce, which does have the butter already in it as you mention, but they also have a version without the butter added. So he could have used the non-butter version of the buffalo sauce.