It was only an opinion, and you took that quote out of context, if you want to be like that it's your choice, although lot's of people have already said that they also believe it would be better to post some information, take it how you want, but we are all allowed to express our opinions.
"...what genre the game is"
This is an important information in business, without a NDA you won´t get any information about the genre.
At least when it comes to a professional project.
If you really think that telling people the genre will affect sales or anything like that , you must be dilludedas knowing the genre does not give any of the story away, or anything that can be stolen.
