Black, who on Thursday sold his majority shareholding in the League One leaders to a consortium led by Jed McCory, broke his silence on Twitter to reveal Di Canio's "fierce" and "uncompromising" nature and suggest Swindon's new owners were better off without him.
"I never got to know Paolo very well. I only met him a handful of times," Black wrote.
"Sitting in a board meeting with him is pretty surreal. I said many times to (chief executive) Nick (Watkins) that we should get the cameras in for a fly on the wall documentary.
"Paolo is a highly intense individual and a fierce and demanding boss, but he is uncompromising and does not manage upwards. I haven't decided how good I think he is at his job - he'd be on your case the whole time but he had a very decent budget to work with.
"The worst thing from the perspective of new owners is that he isn't the type to be told - I think he saw himself as bigger than the club and I think it would have been an accident waiting to happen.
"At least this way the new owners get to pick a manager that they can work with. I know a lot of fans will be unhappy but the important thing from my perspective is that things are in good order."