You cannot draw conclusions from one game. What you can draw conclusions from is match against second best player in the world. Morphy defeated Anderssen 8:3. Carlsen - Caruana was a tie.
Comparing people of different eras is misleading at best. Who's better? Roger Staubach or Patrick Mahomes? The latter was playing during a very different offensive-friendly league but clearly has better stats.
You cannot draw conclusions from one game. What you can draw conclusions from is match against second best player in the world. Morphy defeated Anderssen 8:3. Carlsen - Caruana was a tie.