It was never intended to be an OT for its launch - while I'd love to do that, I already knew that's being made by someone else. I just wanted it to look good and I guess I may have gone a bit overboard?.
Generally, the community hyped for the gangregate in a specific thread (usually a beta thread, etc) until the OT opens a few hours before the game launches.
The threads you mentioned have a different theme to them, so it has to be titled and LOOK like a regular discussion thread. Titles like "What are you looking forward to the most in Neir" Why is Neir a must-buy for you? "Who else is hyped for Neir" would work, but you have to follow up in the OP with comments and examples/images facts that are specific to your title and leave it at that.
tl;dr, you're thread looked like and read like an OT, with all of the info of an OT, so be general and stick to specific topic/theme.