No, it doesn't accuse him of apostasy, but of promoting a false ecumenism which has led to a situation which he himself described as "the silent apostasy of Europe." This fact seems irrefutably obvious.
It implicitly accuses him of apostasy. And as for considering that ecumenism has caused all the problems of the Church in Europe or elsewhere in the western world, I not only do not consider it irrefutably obvious but preposterous. To the extent that the problems are cause within the Church and not in general societal and cultural currents, the fault is one of catechesis and too many people in positions of authority in the Church who do not fully assent, whether tacitly or openly, to the full teachings of the deposit of faith. That is the real problem, and I am more inclined to hold the bishops responsible for that, not the Pope, as I think he has nudged the Church back in the direction of sound doctrine.