They aren't trolling at all.
You have to remember that the world can see what they post. They can't just randomly announce in the comments of a buddy's post. So they put something noncommittal and coy.
The problem is your interpretation and reaction. You see it as "Richards hinted he's coming back!" because that's what you want to see, and every idiotic "news" stealing fan blog churns it out to people like you because it draws interactions.
Be honest with yourself. No one who follows the team closely enough to care is swayed at all by things like that. You've known the reality of Nick's decision since January. If you haven't, you don't care enough to be upset about being misled, even if they were trolling.