A wormcompost really should not have a rotting smell or leachate coming out of it, either one of these indicate that the system is in overload and needs to be corrected.
Leachate means that the "compost" is saturated with
water, the aerobic microbes are dying due to a lack of oxygen and too much water, thus less food for the worm.
Once the "compost" is water saturated and now anaerobic the bad, disease causing microbes take over, ones that attack your plants and even humans.
Aerated Worm tea on the other hand is pure gold, chuck full of defensive, good microbes for you plants.
I would guess that the leachate has a little mineral dissolves in it but the bad fungus/bacteria far out way any good that the minerals bring.
I got my worm bin last year and after holidays and winterstorm excess food, I stuff the wormbins, too much food per lbs of worms and thats when I get leachate.
It stinks and I just flush it down the tiolet.