Possibly, you are right that its in the fact that the test is insufficient. The question is if this is known by Apple or not.

I personally can't see how they could not know, this is not the kind of issue where ppl are going to be blowing there whistle for no reason. So Apple knows there is an issue, if there own tests do not match the numbers of complains(to some degree) even more red flags should be going up.

I am no conspiracy theorist, but there seems to be some valid points in the article.