An idea associated in the reader’s mind with a verse is not automatically isharah. The implication must be genuinely supported by the expression and its linguistic/legal relation.
Grounded indication: “al-mawlud lahu” supplies the wording from which paternal attribution is read.
Unsupported invention: adding an unrelated legal consequence that the text neither states nor entails.
The source’s requirement that the meaning be established by the text is the safeguard against arbitrary extension.