Implications of 'Stockpiled'?

[MisterMark]

From the manual:

An artillery unit that is Stockpiled will be able to fire for longer periods of time, and perhaps with increased effectiveness, without suffering supply problems. In particular,

• A Stockpiled artillery unit fires at an effectiveness modified by the Stockpiled Fire Parameter Data modifier. For example, if this modifier is 100%, then the fire value of Stockpiled units is not modified, but if the modifier is 200%, then the fire value of Stockpiled units is doubled.

• When a Stockpiled artillery unit suffers its first supply test failure, it remains available, but loses its Stockpiled status at that point. Note: while Stockpiled, the supply test applied to a unit uses a supply value that is 75% of normal. For example, if the normal supply value is 80%, then the supply test applied to a Stockpiled unit uses 75% of 80%, equal to 60%, as the supply value for the test.

In regards to the second bullet point... It seems counter intuitive that the supply value for the test of stockpiled units is less (ie 75% of the normal supply value).  But prior to that bullet point the manual states stockpiled units 'will be able to fire for longer periods of time and perhaps with increased effectiveness, WITHOUT SUFFERING SUPPLY PROBLEMS'.

Seems if that were true the supply value for stockpiled units would increase for the test, not decrease.

Am I missing something?

-Mark