@Capn Bloggs:
Did you not read the extract? The restriction applies *only when the automation is not behaving as expected*.
When A/THR is engaged, the thrust levers behave differently to your Boeing, and the idea is that they remain in their detents for the duration of the flight. When A/THR is disengaged (or automatically disengages) then the thrust remains at the last setting prior to disconnect.
The only way you'll end up in the situation you're describing is if you move the thrust levers to the climb detent after disconnecting. Or if they were in the climb detent at disconnect, you'd have to "jiggle" the levers and leave them in the climb detent/region - not recommended procedure in any aircraft, including "your" Boeing!