The job data remains available to ensure it can be restored if needed. The jobs will be marked as deleted, but not removed immediately for this very reason (like moving a file to trash) -- the actual data is wiped 7 days later.
Jobs are deleted daily, but the batch size is limited, so it's normal to see jobs up to a day older than specified in the data retention settings.
Please also refer to this answer on StackOverflow: https://stackoverflow.com/questions/56529737/what-happens-after-scrapy-job-is-deleted-before-it-is-erased/56539708#56539708.