Theymos has full access to the Twitter account, given that Cobra is no longer associated with Bitcointalk.org and it would be logical to assume that the twitter account is part of the forum.

I don’t think the bitcointalk account can be turned into a good marketing tool, although I agree that posting news on Twitter would be useful. In addition, theymos's current twitter account is also inactive, so the lack of interest in this platform can extend to twitter/bitcointalk.

I am not claiming, but I think you will agree that theymos does not spend all day working on the forum and probably when he has time, there are many interesting or important things that fight for his attention.