I for one, disagree with water man's post, and maybe I'm misunderstanding your post. Your quote seem to imply that the only conclusion is to not use cya.

"What about the only reasonable conclusion and recommendation that they should have come up with, namely:

“Because stabilized chlorine products continuously increase the level of CYA in the water, it is recommended NOT to use them!”
Nada! It doesn’t exist. Drain the pool and waste water!"

Most health departments deal with guidelines that have been industry standards for years. This is not to say that they are correct or incorrect, but that, as Chemgeek said, there are some misunderstandings of the chemicals they are testing for. I've been dealing with health officials for YEARS on the salt chlorine generator side.

CYA has always been an issue of conflict.
Outdoor pools need Cya. The two links you attached, are in Lincoln Nebraska and Pennsylvania, both of which winterize pools, and naturally drain down water every year. So, there's a natural dilution of any accumulated cya.

I DO agree with everyone that TOO much cya is not good. I do know that with Salt Chlorine Generators, 80 ppm of cya has proven to be more effective than 50 ppm. CAT controllers, manufacturer of ORP/pH controllers, recommend no more than 50 ppm.