Anytime you deal with large numbers there will be some deviation of the expected and a bag of bird seed is certainly LARGE numbers. That said, even if they run it all through some sort of radiology type machine or whatever to sterilize it there is going to be a few seeds that can germinate. If it all could there would be jungles growing under every feeder and tree around the feeder.
That said, deer love them some bird seed, or any seed for that matter. We had a 1/2 bag of grass seed in the garage at camp and it got damp so we poured it out in the snow. The place was nuked with deer tracks the next morning and they had cleaned it all up.
Bird seed is not cheap and I would stick to more sure thing seeds for planting a plot. JMO