Well, he did preface the entire article with that fact; it's not as if he doesn't give credit. There are any number of reasons not to go into the details of the inspiration during the course itself, and anyway, there's nothing whatsoever to indicate that he didn't mention it at some point.

To imply that this most selfless, compassionate, and generous person not only forgot to give credit but did so as a result of some inbuilt insensitivity to wealth disparity is an egregious misrepresentation. I mean, did you read what the guy's work was about? Is this really a nit to be picked?