Cormier repeated both feats in 2021–22 season,[3] additionally leading the league in both goals and points by a defenseman, and helping the Islanders to the President's Cup Finals, where they ultimately lost to the Shawinigan Cataractes.

[4] Cormier made his international debut with Canada Red at the 2018 World U-17 Hockey Challenge, recording no points across six games.

He also appeared for the Canadian under-18 team in the 2019 Hlinka Gretzky Cup, winning a silver medal.

Cormier later won a gold medal with Canada at the 2022 IIHF World Junior Championships, recording 5 points in 7 games.

[5] Cormier's sister Dominique plays (as of 2024) for the Princeton Tigers women's ice hockey team of the ECAC, after having represented Canada in U18 tournaments.