PDF attributes such as Author, Creator etc. do not appear to being set in the PDF document.
I have tested with the demo project also, which are set to 'Your Company' and 'Your Name' respectively, but when the PDF attributes are inspected (see screenshot on screencast link) they are blank.
We have re-tested this here on iOS 10.2 and after opening this in Adobe Acrobat on a Windows environment as well as with Foxit PDF Reader, we are able to retrieve the meta-data that has been entered in the PDF.