> What if a batch of products is determined to have some QA problems?

If you had bothered to read TFA, you'd have understood that the rules only apply to products that have fully passed QA, were being kept as stock but ended up not selling. They don't apply to experimental batches, to defective or damaged items, etc...

From the site guidelines:

Please don't comment on whether someone read an article. "Did you even read the article? It mentions that" can be shortened to "The article mentions that".