It is also mostly introductory courses. It’s equivalent to maybe 2-3 years worth of a CS degree program if you also don’t take any advanced courses or have a specialization.

Nand2tetris, for instance, is a course I like and recommend to the curious. But it is at best equivalent to a survey course in computer engineering. It’s a motivator to go deeper, but not where a college student should stop. If it were given for credit at a university it would be intended for first year students.