It doesn't really hinge on them not being qualified for the job the way I read it. It hinges on them not being 'the most qualified' for the job. As failure of the interview to me is defined as not getting the job. And interviewing 10 people for every position leads to them choosing a most qualified out of those 10 and leaving notes for future teams looking to fill a position.

I am no way saying their practices are not discriminatory, just that I read that statement differently.

I think due to the complete lack of disclosure about why you don't get a job in the tech industry it will be interesting to see Google have to justify their decisions with the facts to a court. I personally ask after most every interview what I could do to improve, or what I did wrong. With very rare exceptions I am told they can not disclose that information for liability reasons. (Google and Amazon both definitely gave me this answer) A handful of companies have told me things like, we went with a candidate that had more experience in ________. And once a company told me that a project was cancelled so they unfortunately no longer had a position available.