Why does it say 'suspected spammer'?
Because all you do is spam the forum with information about your upcoming book. People don't like it and have started reporting you. The admins have noticed it and began proceedings to have you banned. It usually takes 2-3 days before everyone gets on board. That's why you are seeing that notification.
It's either that or theymos played an April Fools joke on all of us. Damn I read the entire thread deeply and I was so into this book going image by image and seeing how the OP is building it so far. First of all very impressive but when I saw this message and I was little frighten in blink of an eye. Lolz. I really thought the whole book and the op is spammer and then you got me with your tiny text man. My entire April rolled over in front of my eyes. Haha. Theymos did well considering it’s stillborn joke at this point too.
@OP, I gotta say that’s an amazing book you are writing. The dedication you are putting into it is something many fail at. Congratulations for your book and hope to see you releasing it soon.