Interesting link...
There are some technical / minor errors in what he says IMHO, but the broad thrust is about right... He is concentrating on a strange HF factor, pretty unpredictable but now repeated a few times. I think that is the more likely explanation for CGH, than whacky technical issues...
The most interesting part in this context (to me anyway) are the phrases '.....all the way through the detent into forward idle. Then retard the lever again against the stop.' 'Through the detent,' and then retard even further, 'against the stop' - not just 'back to'?
He seems to be referring here to getting out of Rev. I certainly find it is difficult to smoothly operate TLs out of Rev to Fwd Idle, and easier, as here, to go somewhat forward of the idle detent / position and then back to idle. Nil effect in the time it takes re actual engine thrust...
NoD