Not bad, but the big weakness is that the author seems to be very familiar with more expert-level aspects of Ruby, but not so much with Python. And turns that into "Python doesn't have these".

For example, he mentions Python doesn't have an equivalent of method_missing -- it's technically true that there's nothing you define on a Python class to specifically intercept a nonexistent method, but that's because Python's standard facility for this operates more generally at the level of attribute access. Suspect there's a bit too much expectation of Python to be message-passing like Ruby in not seeing that one.

Similarly, Python has plenty of metaprogramming features, they're just implemented differently -- and from a different conceptual standpoint -- than Ruby's. And so on and so forth.