He's only "liberal" in the sense that he doesn't hate lgbt+ and non-white citizens.
Mainstream Conservative parties nowadays do openly hate lgbt+ and non-white citizens. If not enough to expell/"remigrate" then enough to make them all second or third tier citizens.
In case of Alberta, the premier is on record supporting the deportation of non-white Canadians, which is what remigration is. Marlaina and UCP are full blown white supremacists who support remigration.