I think it is a joke.
US noses out China in math meet:
https://www.chinadaily.com.cn/world/2015-07/27/content_21418690.htm
"Team USA won the first place at this year's International Mathematical Olympiad (IMO) held in Chiang Mai, Thailand, reclaiming the crown after 21 years."
There is no 30-year winless span for the USA in this list:
https://en.wikipedia.org/wiki/International_Mathematical_Olympiad
Team members for 2015:
https://www.imo-official.org/team_r.aspx?code=USA&year=2015
Edit: Yes, I did laugh.
Another news report . . .
https://www.maa.org/news/us-team-takes-first-place-at-international-mathematical-olympiad
"No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full."
Lucius Cornelius Sulla - died 78 BC