The screenshot shows reward for sharing, which isn't covered by that.
Based on the screenshot, you're doing the Like rewarding in the non-compliant manner, not the compliant one - doesn't appear that pre-existing likes get the 10 entries.
Liking a Facebook page was not a requirement to enter the giveaway. If you look at the section that shows the giveaway design, the only requirement was to enter your email address. The page they see after they enter contains the social options which are optional to complete.
Instead of saying on the page 'pre-orders are coming tomorrow' you should have an email collection form there. You're likely getting a large amount of traffic and could be losing out on a lot of potential pre-orders because people will forget to go back to your page tomorrow. Just toss in an email collection form saying you'll notify people when pre-ordering opens. Otherwise, neat product.