I found the two adjacent sections you are referring to in the Privacy Policy, and it’s a good question. I have no idea what it means either. Email address I can understand to some extent, but not an anonymous username or a private password no one else should ever see. Quoting for posterity:
Personal information provided by you
The personal information that we collect depends on the context of your interactions with us and the website, the choices you make, and the features you use. The personal information we collect may include the following:
email addresses
usernames
passwords
Sensitive information
We do not process sensitive information.
All personal information that you provide to us must be true, complete, and accurate, and you must notify us of any changes to such personal information.