Caroldecker, using copper sulphate (ie bordeaux mixture) has long since been severely restricted, to the point of being pretty much unusable.
As I pointed out above, it is like antibiotics, use is allowed very occasionally in extremely restricted circumstances. As it happens, I would be happy to use copper sulphate on my crops as a very occasional thing, and (were I organic registered, which I'm not) could make a good case for so doing, BECAUSE my land is very low in copper, so vegetables grown there will be much lower in content of that mineral compared to those grown on a more typical soil.
Actually, the fact that I don't want to have to justify every single decision of that type to an inspector BEFORE taking action to get a derogation, and record it meticulously is one reason that I'm not organic registered.
From the link you quote, which by the way is a minimum standard for the whole of the EU, I would note:
"The use of pesticides, which may have detrimental effects on the environment or result in the presence of residues in agricultural products, should be significantly restricted. Preference should be given to the application of preventive measures in pest, disease and weed control. In addition, conditions for the use of certain plant protection products should be laid down."
It is also worth noting (won't copy here, because it is a huge list), that the allowed pesticides are noted in the document. They are things like soft soap, sulphur in minimal quantities - so yes, some chemicals that have been used since victorian times - but having taken out those which have been identified as harmful to human health.
There are also many, many techniques which would have astounded the victorians, I'm thinking of introducing predatory insects, just for example.