I don't think it really matters to the recruiter if you are qualified, or if they are judged on how many people they source end up getting offers. They are just there to get you in the door.
I suppose that would depend on how the recruiters operate. I'd imagine that at Google's size, they probably have recruiters just feeding people into the pipeline. I tend to assume people aren't just doing a shitty job, in this case throwing people at a wall and seeing what sticks, despite how much it clashes with my "imposter syndrome" mentality.