“I’m not Catholic, so I won’t judge if his criticisms were over the top or not. But we must be in the position to always test what our church teaches and not be afraid to oppose changes that are destructive.”
Discounting some weird political lie, he obviously believes the Cuban bishops or clergy are colluding with oppression. He’s either right or wrong about that. If he is right, then the bishops are going against the teaching of the Church. It wouldn’t be “attacking the Church” in that case. “Hell is paved with the skulls of bishops” is a quote usually attributed to St. Chysostom.
Look at all the recent threads on the priest who was publicly castigated by the local bishops for refusing the Host to a woman who told him right before Mass and in front of witnesses that this other woman was her lover. Those threads were full of Freeper Catholics who were all over that malarkey, simply because it seems to go against all Catholic reasoning. They certainly were not “attacking the Church.”