This definately sounds like advertising blurb.
I never said just give them seaweed and kelp.
Good compost, chicken shit, seaweed and fish emulsion have more than enough nutrients. Plants that are force fed with chemical fertilisers make look stronger and lush and green but they are in fact weaker and more susceptible to pests and diseases.
Insects see in the infrared spectrum and that enables them to identify sick or weak plants. Chemical fed plants give out a wavelenght that says to them eat me. I am lush, watery and weak. More insects= more diseases, i.e aphids spread all sorts of diseases.
Make or buy some good quality compost and do your health and your plants a favour.