You will want to delete it from the page and remove all versions that included the sensitive data, and then purge it from the space trash. Since there is no way to recover this once purged without going to a backup, it's pretty much permanently deleted.
However, depending on where you work, "pretty much" is not good enough. Often after a spillage, I have had security teams demand to see all pages, caches, and db entries had the data to prove that the site has been sanitized.
A quick search did not find any actual assurance from Atlassian that this will completely remove all references to the sensitive data from all cache or databases. Maybe someone else's Google foo is working better this morning. If you require this level of assurance, enter a support ticket with Atlassian requesting some official statement around the policy with sensitive data purging.
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