Manchester United Football Club is an English professional football club based in Old Trafford, Greater Manchester. The club was formed in Newton Heath in 1878 as Newton Heath LYR F.C., and played their first competitive match in October 1886, when they entered the First Round of the 1886–87 FA Cup. The club was renamed Manchester United F.C. in 1902, and moved to Old Trafford in 1910.
Newton Heath LYR F.C. was the name of the football club for over 20 years.
It's definitely correct because it was formed with that name in 1878 and changed the name in 1902, which is longer than 20 years. I think the system got it wrong because it requires analyzing multiple parts of the text and making calculations based on those parts, which is difficult for systems like this.