Bigger hint: Uh, yeah...it is what I think it is. The answer really is 1. This video shows a serious attempt to change the basic hierarchy rules of mathematics that have been in use for at least a century now. They have worked perfectly thus far, and will continue to do so. Sorry, but it isn't going to change just because a few people want to switch it up. Mathematics will remain in the PEMDAS format until civilization collapses and all knowledge of mathematics is lost. Only then...maybe...will the rules change.
Hint: It’s not what you might think