While it's true Russell knew this Ken, this is not the character from the book. The lawyer was named Ken Carter. Russell made up the Ken in the book and the name probably comes from this guy. Russell has done stuff like this before, using names he knows for his lies, he at one point commented on one of his own videos saying something nice about himself under the username "Godfrey Ross" (which is his middle name and the last name of his birth family.)
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Here's a discussion Russell has with "Ken" after storming out of another lawyer's office because this other unnamed lawyer told Russell he had no case and Russell threw a tard fit. Notice how Ken is asking one question after another and Russ is explaining the law
to a lawyer. This whole conversation is Russell trying to tell the audience that he knows more about the law than a lawyer. I guarantee you this interaction with "Ken" is bullshit, even if Russell knew a guy named Ken at some point.