No, that just doesn't follow.
The experts must have been aware there was a potential miscarriage of justice. Otherwise, there's no way they can have access to the records, since the defence needs to instruct them. They were being asked to look at these records in their free time, for nothing, which is something you can recruit people to do in a good cause. So Lee explained the good cause.
None of this presupposes that they would find no evidence of deliberate harm. They might represent her last hope, if she was innocent, or they might find evidence of deliberate harm, in which case there's absolutely no reason to believe they were asked to suppress it.
This is the only way experts can engage with the evidence for a potential miscarriage of justice in the UK. If there's no potential miscarriage of justice, there's no defence instructing them and handing over the files. Once they have their task, their integrity comes into play. And we have been told that they had the assurance they wouldn't be under pressure to suppress evidence of deliberate harm.
We aren't dealing with children here. Of course they would have known they were dealing with a potential miscarriage of justice, and of course they wouldn't expect to give their time if there wasn't a real and urgent need for it. There is simply no way Lee could have recruited the panel without this information. But professionals with integrity would still have been perfectly capable of calling out evidence of deliberate harm, if they had found it.