I don't know for sure whether chemical based nutes kill the bacteria and fungi in the soil or not. I've heard different opinions, but minimal scientific studies to back them up.
But I do know that unsulphered black strap molasses contains potassium, phosphorous, calcium, magnesium, iron, and a few micronutrients- all of which are beneficial to the plant directly.
The carbs provide food for these beneficials, but the fungi in the rhizosphere feed off carbs from the plant and return the favor by chelating the nutrients in the soil to make them more accessible to the plants.