This sounds like a bug we're aware of where an account that goes public -> private we'll reliably purge their tweets from the public index, but if an account goes private -> public sometimes we'll not re-populate the main index correctly.
> we had one person's account whose search results still showed searchbanned tweets
This part doesn't match what I'm describing, but could be explained by the logged in account having access to private tweets in search results that logged out / other accounts do not.
This sounds like a bug we're aware of where an account that goes public -> private we'll reliably purge their tweets from the public index, but if an account goes private -> public sometimes we'll not re-populate the main index correctly.
> we had one person's account whose search results still showed searchbanned tweets
This part doesn't match what I'm describing, but could be explained by the logged in account having access to private tweets in search results that logged out / other accounts do not.