A Contact Delete request has been processed for subscribers who have been sent to previously...

Following a Contact Delete request in Salesforce Marketing Cloud, certain types of data remain within the account:

Contact data in sendable data extensions: This data is not automatically removed through a Contact Delete process unless specifically targeted. It requires separate processes to ensure data is cleansed.

General tracking data at the job level: This includes aggregate performance metrics from email campaigns, which do not store individual contact details but rather overall campaign performance stats.