The brain

[Mystic]

note that "using the scientific method to judge the scientific method is circular reasoning".

This is not your original claim. You claimed that the scientific method is circular, you said nothing about using the scientific method to evaluate the scientific method. Did you think no one would notice? That said, the professor is talking out of his ass.

Science is essentially empirical. It's tested against reality, not arguments. It's not an argument, it's a method. A method of discerning what is most likely true about the things we are able to observe. No matter your opinion on science or how circular you think it might be, the electronic device and internet you're using still works. Science is a process of discovering what works and at least as importantly, what doesn't.

The purpose of the scientific method is to expand our body of knowledge. As a result of using it, we have a LOT of things that work. Most relevantly, the technology you're using to try to convince people that the scientific method is circular.

Using the scientific method to evaluate the scientific method (Is the scientific method accomplishing what it's supposed to accomplish? Yep.) is no more circular than using your eyes to verify that your eyes are working. What else would you use to check if you can see? Whether you can see or not is something you have to determine empirically, and you have to use your sight to do it.

That shows it's circular, but, I will get what you are looking for. Science provides workable theories with data, it never can prove them.