Bill Burk was a friend of Elvis. Of course not a close friend like people like Red West, but he knew Elvis quite well.
In the 70s he didn't had much contact with Elvis. In -I believe- december 1976 he saw a show of Elvis and was extremely supriced how bad Elvis was. He looked and sounded unhealthy and uninspired. So he wrote -as a journalist- a negative review for that show.
I guess that Elvis -if he was aware of that article- wouldn't have been that happy about it. But we all know that Bill in fact was right: almost half a year later Elvis was dead because of this bad health. And we all agree that many shows of 1976-1977 were uninspired.
I had a small chat with Bill and he looked as a nice guy. I always enjoy his newsletter.