What is wrong with inferring that “the difference is only in wording” excludes all possible mistakes?

Supplementary Practice 10: Rhetoric of Claim, Evidence, Objection and Reply

• It treats innamā as incapable of restriction
• It mistakes al-khilāf for an imperative verb
• It extends a context-specific restriction into an unsupported universal denial
• It makes al-ṣiyāgha indefinite