I gotta be honest, I'm not convinced that this is solid enough evidence. Do I believe this is Phil's account, yes. Do I think it can be conclusively be linked to him playing WWE Champions to the level of confidence people are claiming here, absolutely not. Does that make you guys wrong, not necessarily.
I live in Japan currently and use Line a lot. If Phil has changed his phone number since the doxxing and his phone itself then that account is 100% dead because its completely impossible to access your account, speaking from experience, i'm currently locked out of my account for changing my number. It could be that Phil has new number and a new line account that we aren't currently aware of, which he'll be able to preemptively lock down. My personal belief is that Phil created this a long time ago, possibly for his WWE champions account or for another app, the account since went dead and he maybe even forgot about the app altogether. Other people know better than me but surely someone as paranoid as Phil would change his number after getting doxxed?
I think the biggest issue with the line account is that its still called 'TheyCallMeDSP'. That to me reads more that the account was created in the past for use in guilds on an app, in reality most likely WWE Champions, and it just isn't being used anymore. As I understand it your name is the same in every chat you're in and I just feel that he would've changed it to his current ingame name to avoid confusion.
I would encourage everyone here to put these findings in a sort of purgatory as it is evidence of his phone gambling addiction but not sufficient evidence to be the nail in the coffin a lot are claiming it to be here.