I for one agree with you. I think your analysis is spot on, and that the author is...well, wrong.1. I believe Tom honest.
2. I believe Tom to be honost.
3. I believe that Tom is honest.
My take on the above: Almost nobody would say 1, but if they did it would be interpreted to mean the same as 2 and 3, which are exactly the same in meaning.
P.S. Just out of curiosity...is this well-known linguist a native speaker of English?
Student or Learner