I understand what you are saying, Me, but I'm not sure how helpful it is.
Sally the OP asked if he was nice to his dogs, I gave a reply saying "yes" and explaining the balance of methods I had seen him use so the OP knew what to expect. You then jumped in to say I was wrong - which made things less clear I feel!
It's not helpful to say someone uses positive methods only when they don't as it may give the OP the wrong impression of how things will be. I have yet to see anyone train a sheepdog with positive reinforcement alone. That is not to say negative methods are cruel as I think I made clear in my previous posts. Negative techniques can = brilliant results and leave both dog and handler feeling very positive!
If you can understand what you are trying to achieve (eg. moving the dog off the sheep) and take the time to understand negative reinforcement training (eg. dangerous ground type things) then your training can only benefit - hence it was a helpful post.
Positive
Negative
Punishment
Very different things, Mr Derek seems to employ a lot of the first, a bit of the second and very, very, little I am sure, if any, of the third.