Per notin, no he didn't.
According to Dombrowski, Cora went from batting Hanley third in the order (and occasionally second in the order,) to wanting him off the team? No dropping in the batting order? No benching more often? Nope - #3 hitter out to out the door.
That's a pretty drastic change.
Hanley was DFA's because his overall contract has been a failure and one hot month didn't change that. And because his option needed to be avoided. I get why DD can't admit the latter part, but the story he's telling makes Cora look like an absolute idiot. "Cut my number three hitter!!". I don't think it was necessarily even the wrong move, but I don't buy the story from Dombrowski.