Child access visas

[Munachim]

Hi, please I need help to clear this. I'm about to change my status from a spouse visa to the Child Access visa as a triage has been broken down. I still maintain contact with my child, I work and pay child support. My ex has agreed to write me a statement but then I'm a little confused as it states something different in the home office website:
VAT23.4 What evidence should the applicant provide to demonstrate that they have access rights to a child in the UK?
They should show evidence from a UK court that they have access rights to the child. Residence orders or Contact orders granted by UK Courts, or a sworn affidavit from the non-applicant parent, (that is, the U.K. resident parent or carer of the child), confirming that the applicant parent can have access to the child, and describing in detail the arrangements made to allow for this access, are taken as suitable evidence of access rights. (If contact is supervised, then the statement must be sworn by the supervisor).


Does my ex have to write a statement and go to court to have it stamped? Or is the statement enough without any court stamp? Thank you