True, though that blog post also says "We do not crawl or scrape websites to source these lyrics.", which was definitely not true (though may be now).
I think it was true then. I believe their claim was usage via third party?
Google licenses the lyrics through a third party, LyricFind, which in turn hired people to transcribe them. In a small percentage of cases, those transcribers did not do their own work and instead copied lyrics from Genius.