The code he gives, and the explanation of the busy beaver problem, strikes me as pretty poorly explained. If I didn't already know about the busy beaver problem, I don't think I could get it from this explanation.
hi, author here! Thanks for your comment. Which where the parts that are poorly explained? I would love to get some feedback from you. I just started learning about computability theory, so maybe I explained some concepts wrong. Also, english is not my first language, so perhaps I lost something in translation.