No, you're not missing anything: they reneged on a standing offer per the linked website. Bait and switch. It's incumbent upon the party making the offer to withdraw it. They didn't -- not on the linked website, anyway -- so they should have honored it. As they wrote, "we will seize an opportunity when it presents itself." Well, that's what you tried to do, but apparently they don't think it works both ways. F 'em.