When exporting from InCopy to PDF with “Include Notes As Annotations” checked, the author name of each PDF annotation should not have the note’s date and time appended as a suffix. Doing so effectively attributes each annotation to a different author and makes PDF comment filtering based on author name (or datetime, would that filter eventually exist) impossible. I consider this a bug.

The date and time of a note should instead be stored in the “modification date & time” metadata of the PDF annotation, which Acrobat populates and displays for annotations created with itself.