Article 50 of Lisbon Treaty

We keep hearing about negotiations that have to take place in view of the Brexit vote. And it makes me wonder how many people have actually read it. The Treaty the UK has signed up to clearly states that an outgoing State will NOT have ANY right to negotiate anything:

4. For the purposes of paragraphs 2 and 3, the member of the European Council or of the Council representing the withdrawing Member State shall not participate in the discussions of the European Council or Council or in decisions concerning it.