My guess is it's a combination of Hamada and Johns having become friends along the way, and also Johns being a principal mover on the TV side (Stargirl, Titans, Green Lantern Corps) and AT&T having placed "Make HBO Max succeed" at roughly the same corporate strategic priority as "Totally fuck up the 5G rollout while raising fees." It's interesting, though; some insiders have felt free to take shots at Johns. Diane Nelson, former head of DC Entertainment, said on Twitter after she left that he was "no friend of [hers]". David Ayer, when asked why the slide in Suicide Squad that said Harley Quinn was an accomplice in the death of Robin contradicted Ayer's backstory, said that Johns had added that in after the studio took control of the movie. (Ayer's story was that, when the Joker killed Robin, Batman hauled off and smashed his mouth in, leading to the grill and the "Damaged" forehead tattoo. The Joker was seen to have both of those in the scene where he met Dr. Quinzel, so Harley couldn't have been present when Robin was killed, much less an accomplice.)