MOSFET power dissipation calculations - Diodes Inc. datasheets
Yup, that's the way MOSFET datasheets work.  The maximum current rating really means "This is the maximum current you can ever possibly get thru this thing, if you were to somehow not violate other specs in the process, although we have no idea how to do that.  We put this here because we think it's cool, and maybe someone is dumb enough to buy a truckload of them before realizing they can't actually run the part at this value for any set of real world conditions".

Basically, each of the limits of the device are specified separately.  You have to look at what you're doing and carefully check each one.  The real limit on current is usually die temperature.  To check that, look at the max Rdson for your gate drive level, compute the dissipation due to your current, multiply that by the die to ambient thermal resistance, add that to your ambient temperature, and compare the result to the maximum die operating temperature.  When you figure all this backwards to find the maximum current the device can take before overheating, you'll usually find that's well below the absolute maximum current spec.