This site's footer states this specific wording directly: it does not guarantee any specific sexual performance outcome.
This is a more specific disclosure than a general "no guaranteed performance outcome" statement — worth reading the word "sexual" here as this site directly naming the category of outcome it is not making claims about.
This specific disclosure is worth reading alongside the five bonus guides' relationship and intimacy themes — the disclosure addresses outcome claims specifically, distinct from the educational framing this site applies to those guides.