Training that function is not banned. Concentrating information is not banned. I have no idea where you're taking that from. Only making use (i.e. putting into

Training that function is not banned. Concentrating information is not banned. I have no idea where you're taking that from. Only making use (i.e. putting into service a product containing it or placing that product on the market) of that function in a manner that is listed in article 5 (which is quite terse and reasonable) is prohibited unless covered by an exception. Making use of that function in a manner that may be high-risk (see article 6 and annex III, also quite terse and reasonable) leads to the requirement of either documenting why it isn't high-risk or employing measures to ensure that the risk is acceptable (see article 9, item 5). IANAL