What "Applicant Confidential Data Form" has to do with tenure-track positions?
I've received this form from hundreds of employers that later rejected me. I think schools that use it will send it to every applicant. So it doesn't mean anything except that your application was received.

I believe the reason for it being a separate form, rather than part of the application, is that it's meant to be for statistical purposes only, and should not affect the hiring procedure. The best way to achieve this is to ensure that the hiring committee never sees it. So they send a separate form, to be returned to a separate office within the institution, which holds it confidential.