I was curious myself about whether there would be reporting restrictions about the Lucy Letby case if someone was to be charged with perverting the course of justice. It would be difficult to conduct a trial accusing someone of perverting the course of justice and allowing serial killer to harm babies could run if there is a serious question mark over whether there was ever a serial killer at all!
Personally I think this is just the police doubling down because they haven't liked the criticism lately and were annoyed that the special branch of the CPS refused to bring more charges against Letby. Convicting someone else on the narrative that there was a serial killer would be a big win for them.
I think LL is almost certainly going to be freed at some point, no case can withstand that many challenges, there will have to be an all new inquiry instead of Thirlwall, and then the same hospital bosses are going to have to be re-investigated for gross negligence manslaughter but from a whole new angle instead 🙈