Equations can help see the truth better if you look at them from various angles.
I thought the equation in the link article was this ;) :
Torque (ft-lbs) = horsepower x 5252 / speed(RPM)
By the way, here quoted are the last sentences from the link:
"In summary, there are a lot of misconceptions about horsepower and torque. Remember that it depends on the gearing, horsepower and flatness of the horsepower curve - but very little on the torque number by itself. If two engines have the same horsepower, with the proper gearing they will perform very similarly, but the same general statement can’t be said for two engines of the torque."