Yep, it's absolutely true.

Reference: https://www.canada.ca/en/canadian-heritage/services/crown-ca...

""" Queen Elizabeth II was the first of Canada's sovereigns to be proclaimed separately as Queen of Canada in 1953, when a Canadian law, the Royal Style and Titles Act, formally conferred upon her the title of "Queen of Canada". The proclamation reaffirmed the monarch’s role in Canada as independent of the monarch’s role in the United Kingdom and other Commonwealth realms. """