it is really not doing much more than repeating the points
So do many users 
Maybe, maybe not. There are a lot of posts that are sufficiently bad that it makes it difficult to believe they are actually written by real people. Sure, some people may not care to put a lot of effort into their posts, and some people may not be especially intelligent, but I find it hard to believe these are reasons why we have so many shit posts, given the scale of the problem.
Looks a more than decent answers to me.
Do you think anyone can use this G-OpenAI platform to write posts in bitcointalk forum, and is there a way to detect this?Maybe we need to have some kind of detector for text written by bots, but I often think that some people are worst than AI after I read their posts
A better solution would probably to group posts potentially written by a GAN with all other posts, and enforce the rules accordingly. Would the "post" that fillippone generated meet the criteria for not being removed by the moderators? Maybe, maybe not.