Lisbon guarantees are worthless
They have no legal weight and could easily be overturned by a similar future agreement..
It is argued, however, that they may be formally inserted into a future treaty as a protocol, but this will not change their worthlessness since their meaning is determined by the Lisbon Treaty, not vice-versa as is clear from the wording of the decision which states that the concerns will be addressed “in conformity” with the treaty.