AJO - Decision Management vs Experience Decisioning

Just a heads up about some (fairly recent) changes in naming (in both the menu interface on the left of the application, and also the documentation; latter may lead to broken links).

The traditional AJO 'Offer Decisioning' is now called 'Decision Management':

https://experienceleague.adobe.com/en/docs/journey-optimizer/using/decisioning/offer-decisioning/get-started-decision/get-started-decision-landing-page

(although I see OP has already taken this into account)

The newer 'Experience Decisioning' is now called just 'Decisioning':

https://experienceleague.adobe.com/en/docs/journey-optimizer/using/decisioning/experience-decisioning/gs-experience-decisioning

Experience decisioning is Adobe's next-generation decision framework and is a broader concept that kind of encompasses offer decisioning as well within the larger context of personalized experiences. You can try content experiments before targeting, and there is decision policy and strategy sequence that can be configured to rank and deliver real time offers based on audience, context data and decision rules.

As of now experience decisioning decision policies are available for use in code-based experience campaigns only.