Lara here from Shopify.
About your link you're trying to post being marked as SPAM, you can use the “Report a Problem” link on your account to let them know more about what you're seeing.
I navigated through your store and I can't see any apparent violation of Community rules. There is a section mentioning that SPAM would be considered a violation as you can see here, so it makes sense that your post would receive that message. My guess is that once your post is reviewed, everything else should be back to normal, but we can't interfere with that decision. This is something which is out of Shopify's control and in Facebook's hands.
You should hear back from them soon, reviews usually take no longer than 48 hours, and you can always reach out to Facebook's support to ask for updates on your case.
Hope you can get your Facebook page running soon!