No — reliable public sources do not currently confirm that Jason Robertson is left-handed.

Jason Robertson is an American professional ice hockey left wing for the Dallas Stars of the National Hockey League (NHL). Born on July 22, 1999, in Arcadia, California, he quickly emerged as a promising talent in his youth career.

Robertson played junior hockey for the Kingston Frontenacs and Niagara IceDogs in the Ontario Hockey League (OHL), where he showcased his scoring prowess and playmaking abilities. He was drafted by the Dallas Stars in the second round, 39th overall, of the 2017 NHL Entry Draft.

Since making his NHL debut, Robertson has become a key offensive player for the Stars, known for his elite scoring touch and puck control. He earned a nomination for the Calder Memorial Trophy as the league's top rookie in the 2020–21 season and has continued to be a prolific goal-scorer.

His consistent performance and ability to generate offense have made him one of the most exciting young players in the NHL. He is part of a hockey family, with his younger brother, Nick Robertson, also playing professionally.