Actually that is right. Horsepower is quite meaningless, engines of today with same horsepower will out perform 40 years old engines in all metrics that are important to us.
what does this even mean?
Here is a link to the metrics. https://en.wikipedia.org/wiki/Vehicular_metrics
Here is video explaining why horsepower doesn't really make that much sense. https://www.youtube.com/watch?v=gC2-JKO0c2I
Just like calories, horsepower doesn't explain much.