You don't need any internal knowledge to realize Hand's been one of the most inconsistent closers in the game for a few years now and becomes completely unusable for stretches that can last months. He's fallen into one of those ruts, only has a month left on his contract and they can't trade him, so cutting bait isn't a real surprise. He's not someone who can battle through when he doesn't have his best stuff. In 2019 he started out dominant and then had a two month stretch in which opponents hit .360/.418/.584 against him and was temporarily removed from the closer's role. His 2020 season started off poorly, but then he got into a groove. Fortunately for him, the short season helped him avoid the terrible stretch we all knew was coming... except it arrived in the playoffs. He had also lost 2 MPH off his fastball while he was in Cleveland. The strange thing is that he had recovered the speed on his fastball this year, but he was relying on it more than ever before at the expense of his slider.
He's like Fernando Rodney, if you great season out of him, get rid of him and let his next team deal with the inevitable meltdown that's coming.