I meant no disrespect to Carolina. They are an exciting team, but they have no historical ties to Toronto. It should have been against an Original Six team.
I doubt the Leafs or Sportsnet wanted to give up a premium O6 match-up to a 2PM. Hence, Carolina.
Plus, even an O6 team would technically be inaccurate: Toronto & Montréal are the only two extant teams from 1917 and the Habs first game was against the original Ottawa Senators. The Leafs played the Wanderers, which folded before the season was over.
In alternative universe, the best possible opponent for this game could have been Hamilton (the Québec Bulldogs took the Wanderers place in 1918 and then relocated to Hamilton in 1920), IMO, but obviously that never materialized with Balsillie being blackballed by the league.