hydroponics is mostly chemical farming. But aquaponics can be fully organic. The big difference is much of the nutrients from fish poo is colloidal, and aquatic organisms can form symbiotic relationships with roots much the same as in soil.

But the USDA standart lets traces of nasty things much higher amounts than strictly organic. For example, gypsum is allowed, even if it comes from phosphate production, which has trace uranium and radon in it.

To me it is all the same - I consider it all poison unless I can be satisfied all inputs are free of poison. They have Know Your Customer for money, i want Know Your Farmer... a fully auditable record of their inputs.