Never heard of Southern AG, but it looks good to me.
I wouldn't buy that jar of "bacilus compost tea" if it cost more than $10, and even then. Extremely simple to make your own LAB culture, just need plain white rice, water, milk, and brown sugar.
You'll end up with 1-2 32oz mason jars full of your own LAB culture, that you only need to use 1tsp per gallon of water. It'll last a long ass time.
Regards.