I would imagine it had to do with price, after a quick Google search it seems like they run around $60. I don't think they want to carry jeans that expensive.
Do your guy's stores not have the actual levi's branded section, and not just the denizen version? I buy the 512s but they're the same price and online it says they carry them
Many stores now do. All stores carried the Denizen sub brand by Levi's for Target, but they started to roll out Red Tab a few years ago. We just got our selection a few months ago, about a year behind other stores in our area. It's a gradual tiered rollout, testing the market.
My store carries 501, 511, 512, 505, straight and athletic. However, we're really low on stock on all of them. We didn't have 501s when we first started carrying Levis.