The ECFE option in the Ed-Fi documentation (Data Mapping Matrix) and API is a valid descriptor value, and vendors should incorporate it into the MCCC collection for Ed-Fi.
Both LEDE and LEDP have been in MCCC since 2018, and they are listed in Ed-Fi documentation (Data Mapping Matrix) and the API correctly. If you are not seeing LEDP in Ed-Fi documentation or the API, make sure you are looking at the latest documentation and a new sandbox, respectively.
A vendor noticed differences between MCCC, the Data Mapping Matrix and the Ed-Fi API in Curriculum Codes / CurriculumUsedDescriptors: