I don't understand the argument. Kareem has never been interested in shameless self-promotion, and he doesn't seem like an egomaniac. By most accounts, he's an intelligent, deeply private and decent person whose one downfall was aloofness with the media and fans. That should sound pretty familiar to all the Russell fans.
Perhaps Kareem feels, for whatever reason, that he's not getting the respect he deserves. Any proud individual has a right to feel that way and express that opinion.
The fact that Russell has a different style with this sort of thing doesn't make Kareem's actions wrong, in my mind.
As an aside, my two favorite basketball autobiographies are "Second Wind" by Russell and "Giant Steps" by Kareem. I think anyone who reads both will be struck more by the similarities between the two men than by their differences.