You know the world doesn't revolve around Hanyu. All they are doing is just posting posts of them sightseeing and their training. It's quite normal stuff. I don't see why they need to tone down as long as they're not posting about Hanyu without his permission.
I was not talking about their personal post like sightseeing but about training , anyway there is a privacy policy within TCC so I don't think there will be any problem and it's not only about Hanyu , never said that the world does revolve around him