The guy who originally posted it did provide a picture of his post, which he apparently saved when it was moderated. He has a Gamefaqs account, so he can't edit and even if he could edit the post was deleted long before the Dojo update. Additionally, quite a few people claimed that they remember the original topic and that it did have the Dragoon stuff.
The info could still be wrong of course (even the poster emphasized this), but the post itself seems to be real.
…Yeah this is the part where I admit I'm a huge nerd and looked way too far in to this.
Edit: Found the picture.