An Apostille only certifies the origin of the public document to which it relates: it certifies the authenticity of the signature or seal of the person or authority that signed or sealed the public document and the capacity in which this was done.
An Apostille does not certify the content of the public document to which it relates.
Apostilles are not grants of authority and do not give any additional weight to the content of underlying documents.
An Apostille may never be used for the recognition of a document in the country where that document was issued – Apostilles are strictly for use of public documents abroad.
It is up to the country where the Apostille is to be used to decide how much weight to give to the underlying public document.