Liverpool beat Bournemouth 9-0 to break the record Premier League.
In the era Premier League the score 9: 0 was only recorded 4 times. Manchester United beat Ipswich in March 1995, Leicester beat Southampton in October 2019 and Southampton conceded 9 goals to Manchester United in February 2021.
Liverpool have twice managed to defeat a league opponent by 9 goals, but not in the era Premier League. This first happened in a game with Rotherham Town (10: 1) in 1899, then the teams played in the Second Division. The second time was in Serie A in 1989 against Crystal Palace.
