As a current student, I don't buy what they're saying one bit. If this is the case, why do they ask for your GPA when you apply online for a programming role? More anecdotally, everyone I know who made it to the interview process had a stellar GPA. Most were members of the CS honor society on campus.
I don't have any hard proof, but it's clear to me that at least for new hires, GPA is a big requirement for Google.