The old editors were replaced by rather clueless young ones and they decided to phase jazz out. Steve was a nice guy who became pop music editor, but his area was definitely not jazz. The new regime felt that music was secondary to the equipment required to play it. Actually, street (i.e. non-subscriptions) sales of the magazine always dropped when a person was on the cover, and it didn't matter how big a star that was. A piece of insignificant equipment outsold Streisand, Miles, Elvis, anyone.
Stereo Review quickly became a home theatre-oriented magazine with only token music reviews. I haven't looked at it in many years, so I have no idea what these people are doing now, but they quickly drained off the publication's human qualities, which--imo, lent it a certain charm.
So, to really answer your question, Jim, Steve Simels was not really interested in writing about jazz, he was just going with the flow to preserve his job.