Here's their disclaimer:
"Herbs and micro-greens can be extremely great filters and will thrive with the EcoQube, but for that same reason, it is EXTREMELY unsafe for food consumption. Chemicals used for aquariums are NOT safe for human consumption and the plants WILL soak these chemicals up. Consumption of the plants grown in the EcoQube is NOT recommended for human consumption."
Note: The large type is theirs, not mine.