The guidance published in 2022 aims to clarify the circumstances in which information can be shared with another agency, the considerations that need to be taken into account to ensure sharing information with another agency is appropriate, and the importance of involving children, young people, and families in the decision to share information with another agency.
It does not tell you how to safeguard / protect children and young people (this can be found in your child protection guidance), but it does give you practical advice on data protection as part of the safeguarding process. The ICO’s role is as the regulator of information rights, not of safeguarding practices.