It's interesting that only some of those charicatures are offensive to us today. (Not being critical of your comment, the portrayal of black people in Asterix makes me uncomfortable too.)
Asterix was written between 1959 and 1977 (with other people taking over after the death in 1977 of René Goscinny).
Racist stereotypes were mainstream then. It's shocking today to see it.
But what do we do about the racism of the past? Do we hide it? Films about the Dambusters normally change the name of the dog. It had been called Nigger by the aircrews. Or do we stay accurate and provide a lot of context before presenting the material? This happens when teaching Huckleberry Finn.
I'm glad this blog post didn't try to hide the racist depiction.
I like this article about how to read a racist book to your children: https://www.nytimes.com/2012/06/17/magazine/how-to-read-a-ra...
The blackman looks like a racist? Well, I don't see it in that picture.