It's a long question is that why? Even tried just pasting the question here, wouldn't work.
As you noticed, we have automatic spam filtering in place. On longer posts, it can get overzealous and block legitimate submissions. The exact details of the algorithm aren't public for obvious reasons, but we can usually tell you what happened if you contact us and include the content of the post. Posting on meta generally works as well.
I see you were able to work around this specific situation already, but I figured I'd leave a more general response for anyone else running into a similar issue.