My post was responding to the person who used that article to say that calling him Chet is fine. The article doesn't support that.There's also nothing in the article that suggests what he "likes being called".
I vividly remember him being called "Chet" many times in interviews during his playing days. He clearly hasn't stated anywhere that anyone has seen that he doesn't like it.
So maybe it's not a big deal.
I stand by my position that people should call him by the name or nicknames he wants to be called by. As you note, there's not a strong indication that he doesn't like Chet. At the same time, it seems like people close to him refer to him as Chester. So I'll be using Chester to match what the people around him use.
But go ahead and call him Chet or Sally or whatever.