you've got the government lawyers saying that it isn't actually legally tight.
The Schools Week leak doesn’t include the full text of the legal commentary, so the nature of the concerns raised isn’t entirely clear.
However reading the selection of quotes, the lawyers’ concern seems to be that the guidance’s explanation of the under-pinning legal framework doesn’t go into sufficient detail, doesn’t spell out where the legal test is from EA2010 versus from safeguarding legislation, and doesn’t emphasise the exceptions as much as the lawyers would like. One criticism for example is that the guidance says “there’s no general duty to do X” but doesn’t also say that in some specific (aka non-general) cases, there may be a duty in that particular instance.
It seems to me that it’s possible for “there may be a specific duty in some individual cases” and “there’s no general duty” to both be accurate. Caveat IANAL.
It could be that the policy set out in the guidance is rational and lawful, but that the wording of the explanation for it isn’t quite nit-picky enough for the lawyers. It’s out for consultation, so those who think the legal explanations miss the mark could explain why in their responses.