If an email has been permanently deleted, it is unrecoverable by the user without a backup and recovery solution in place. However, an organization's Google Workspace admin may be able to recover the emails via one of two ways:
Emails may be restored from the Admin console within 25 days of deletion. After the 25-day period, the data is purged forever.
Mailboxes (including deleted messages) from the past 30 days can be retrieved using the Email Audit API.