From the Daily Mail:

In an interview, Guglielmi acknowledged that, before anyone visits the home of Biden or any other former president, the Secret Service conducts a background check that generates electronic records on the visit and the results of the background check.

Those records are never expunged.

Guglielmi told DailyMail.com he never intended to mislead. When asked for comment by reporters, he said he explained how guests and workers who enter the homes of Biden and other former presidents are screened.

https://mol.im/a/11654295