I don't have a dog in the fight. I'm just reading the article casually. I understand the point you are making and have some sense of why Redis has the license structure it has. I don't have any criticism of it. I'm glad for its success.
The description of Redis would be out of place in an article about Redis. For an article about licensing, the statements about Redis are not a terrible way of pointing out that there are a myriad of flavors in the world of open source. The description has cosign similarity not relational calculus's exactitude. But I still see why it might elicit your response.
Anyway, thanks for all the fish.