Is this U.N. Warning About Massive Impact of U.S China Trade Tariffs Necessary?

Yes, the U.N. is doing their part to chime in with a warning about the massive impact of continued U.S. /China trade wars having the potential for massive impact. But since the U.N. is not an economic organization is their warning necessary? What political motivation could have motivated this warning that was not needed and not asked for?

https://www.bbc.com/news/business-47126114