Not familiar with the nutrients , but it looks organic (kelp and algae) , the EC will not measure organic molecules like Urea , Ammonium and etc . Most of the organic things are not fast acting and they are poor water soluble , meaning they are provided as big molecules and needs to be broken by the living bacterias in the soil , those numbers are telling you after the compound break out in soil what will be the analysis . With EC/TDS you measure soluble salts you cant measure organic molecules .
Another thing from big importance is to have EC meter with temperature compensation , EC readings are totally different on different temperatures , not even close . If you dont have one with temperature compensation the correct reading will be on 25 C (for NaCl TDS/EC Meters) .