No. It doesn't. You're referring to a misreading of article 49.2 which reads:
A Member State which decides to withdraw shall notify the European Council of its intention. In the light of the guidelines provided by the European Council, the Union shall negotiate and conclude an agreement with that State, setting out the arrangements for its withdrawal, taking account of the framework for its future relationship with the Union. That agreement shall be negotiated in accordance with Article 218(3) of the Treaty on the Functioning of the European Union. It shall be concluded on behalf of the Union by the Council, acting by a qualified majority, after obtaining the consent of the European Parliament.
Nothing about that states that the EU must enter into a new trade treaty with the UK; let alone that it would be required to offer us terms as generous as the ones we currently enjoy. The fallback option is the maximum tariffs agreed with the WTO.
The EU is
much bigger than the UK. So although there is a negative trade balance the relative importance of UK trade to the EU is less than the importance of EU trade to the UK.