Someone typed it and hill signed his name to it.
What happens if a dropping-out document turns out to be forged?
Well that’s interesting.
Screenshot: Joe Biden Drops Out of Presidential Race, But Signature on Document Doesn’t Match Official Signature from Other Documents – No Video or Photo Evidence of Signing
https://www.usasupreme.com/screenshot-joe-biden-drops-out-of-presidential-race-but-signature-on-document-doesnt-match-official-signature-from-other-documents-no-video-or-photo-evidence-of-signing/