He’s been clear that the working environment was not ‘comfortable or safe’. That is why he left and has refused to return or have anything to do with Dr Who since. He’s been more circumspect over the years about saying more but other people who worked there at the time have said there was little to no support, tipping over in to bullying. Further to that they have also said that a lot of this was not about Eccleston himself but more him trying to advocate for the lesser mortals working on the show. All of that was said years ago, but it all became a lot more of an ‘Oh, so that’s what it was’ moment when the allegations against Noel Clarke and John Barrowman came to light.
Russell T. Davies claimed he knew nothing about the sexual assaults carried out by Clarke. Christopher Eccleston clearly does not believe that to be the truth. And RTD couldn’t possibly claim to not know about JB, it was open, not even an open secret, just open. There’s footage of it being joked about at fan meets. Which makes his assertion about NC, unbelievable, it seemed to be the culture of the show. And in 2023 CE was much more specific when asked what would it take for him to return to Dr Who:
‘Sack Russell T. Davies, sack Jane Tranter, sack Phil Collinson, sack Julie Gardner and then I'll come back’
He clearly feels there was abrogation of the duty of care by the team in charge. So yeah, on balance, I doubt RTD will be doing any exposes anytime soon.