As part of the 2021 Canadian Olympic swimming trials in Toronto, Liendo broke the national record in the 100 m butterfly event, with a time of 51.40. This qualified him for the 2020 Summer Olympics in Tokyo. Liendo competed in three individual events in Tokyo (the 50 m and 100 m freestyle and the 100 m butterfly), but did not advance beyond the semi-finals in any of them. He was part of the Canadian team in the 4x100 m freestyle relay that unexpectedly qualified to the event final and the finished in fourth place, 0.60 seconds back of a bronze medal.