I'm not sure it was stated correctly.....
The weep water should be connected, using a Normally OPEN solenoid. This is so that a power failure will fail to a protected state.
If the weepmizer is connected correctly to the N.O. solenoid, the solenoid is OFF when the light is ON, and vice versa.
I've got a car wash helper, that after 10 years, still doesn't understand that OFF (the light on the weepmizer) means ON (weep water flowing). It's counter intuitive.