Prudent remarks on Castro by Sanders?

Bernie Sanders seems to have a particular connection/interest for political gain IMO, to the Castro's particularly, the late Fidel, and he has made comments of late regarding the one time dictator. Do you think he is prudent in bringing this individual and his regime up?
https://www.huffpost.com/entry/bernie-sanders-defends-fidel-castro-cuba-revolution-comments_n_5e53c292c5b6a4525dbe1b6c