Newcastle's victory on Tuesday night halted their four-game losing streak in the Premier League and handed Unai Emery's side their first home defeat of the season.
Arsenal's win, coupled with the result of the Manchester derby, puts Mikel Arteta's side eight points clear of Manchester City and nine ahead of Newcastle and Manchester United, reports Xinhua news agency.
Aubameyang, who hadn't scored in the league since December 16, broke the deadlock in the 50th minute before Bukaya Saka added a second with style in the 61st
Liverpool had won the 2019-20 season of the Premier League. The Klopp-led side had sealed the Premier League title on June 26 and lifted the trophy on July 23, after they played their final home match of that season.