Paphitis,
Your take on offshore companies is a little influenced by the adverts of the company creators. The US court in the case above might not be able to touch the assets themselves, (ie no remedy in rem) but can definitely use an order against the person and if he does not comply then deal with the case as contempt of court and shove him in jail for a long time. There are cases when the court can and will look behind the "corporate veil".
Offshore companies are more organizational tools than tax avoidance or fool proof asset protection.
As to the original topic which is the legal opinion of the EU official, it is no surprise. The EU has NO CHOICE in the matter than to support the European legal order which is simple and straightforward: the right to property and its enjoyment is a HUMAN RIGHT and it cannot be curtailed or diminished arbitrarily. It is that simple.