Bacteria are specialized. They evolved to take advantage of certain environments and food sources. If they all lived in and ate the same stuff we would just have one massive colony world wide. Whatever could compete the best.
The bottle you mentioned has the stuff needed to attract compost kinda bacteria. They take organics and break them down. Sometimes doing that results in nutrients available for plants to take up in the right ionic form.
In hydro running ionic salts like gh there is no need for those bacteria. Keep them in the organic soil grows. Breakdown of organic material only hurts us in hydro. Ph swings for example.
There is nothing wrong with the product it is just being misused if running chelated salt nutes in hydro.