Starting March 2023, SAP AppGyver is renamed to SAP Build Apps, and you can find the related document here.
What is SAP AppGyver application development?
SAP AppGyver is a no-code development environment that allows users to build business applicat...
Build Apps is an SAP-recommended option. Since SAP Sales and Service Cloud Version 2 is built on Open Architecture standards like REST APIs and Business Events, Customers and Partners can choose their own Platform for extensions.
SAP Build Apps is one of side by side extension options for SAP Sales Cloud Version 2 and SAP Service Cloud Version 2.
SDK will remain an extension model option for the Cloud for Customer Sales and Service Cloud.