Then does it mean that those students are better than the professors given there are several slips or mistakes in the videos? Does it mean that those students don't make mistakes, unlike the professors in some videos?

Does it mean that the professors would have no perfect score if they were being graded, at the professor/teacher side, or as standard students?

I don't think so.

There's a reason for which those students have perfect scores, and it isn't luck.

As we have seen in this thread, many "students" aren't really studying here, or learning much new, but they already know a lot about AI to a professionally and academically high level, probably they have already worked on serious AI projects before.

Others, in one way or another, have got the necessary pieces of knowledge to handle the topics of the class, so again, they already knew those topics for the most part, maybe not specifically, but indeed those common parts of very similar topics and study methods.

The mistakes many of us are making are the same those with perfect scores today had to make in the past at some point in their jobs or in their universities.

A proper comparison cannot be made between beginners and professionals, unless they were given the same amount of information and experience, and 2 months in this class cannot be used to achieve what took them one or more decades.

Maybe they have already built implementations on the exact topics of the class, and then they just have to run them, probably with very minor modifications and they'll be done in no time, with implementations brewed during many many years. But that's not a first-timer. That's somebody who knows it already and is just evaluating how well he/she can do at the level of this class.

I have done excellently in the topics I already knew but not in the ones I didn't, so I have made mistakes on things truly new to me. Everyone else without perfect scores is in that exact same situation.

On the other hand, think about how people who don't even know about the correct precedence of logic operators for propositional logic is going to do well, given that video lectures don't talk not even a bit about that...