Ok, I haven't looked at the links, but as I understand it if he has one parent who is a carrier, he could be. If both parents are carriers then he could be affected.
It is ok to breed from carriers as long as they are bred with a clear, none of the pups will ever be affected. Any of those offspring could be carriers and again should only be bred to clears. Affecteds can also be bred to clears and will only produce carriers.
The DNA tests give us the tools to breed with knowledge and without producing affected dogs and losing some great dogs from the gene pool.
To remove all carriers and affecteds from the gene pool can only do harm when you think how the gene pool would bottle neck.
What is needed is for more people to test, many bitch owners take the easy option of just using a clear dog, but could still be producing carriers. We don't have the problem in Flatcoats in this country, but it is in other countries and as yet we have no dna test.