It sounds like they're going to try to catch and remove that - one of the bullet points under DOCX Benefits on https://www.uspto.gov/patents/docx reads:

> Privacy: provides automatic metadata detection (e.g. author and comments) and removal features to support the submission of only substantive information in the DOCX file.

And, then further down in the FAQ it says:

> What happens to the metadata in DOCX files?

> Metadata is generally removed by applicants prior to submission. However, if metadata is found during the validation process, it is automatically removed prior to submission. Examples of metadata include author, company, last modified by, etc. The only information that is preserved is the size, page count, and word count.

> Outgoing DOCX documents (i.e. Office actions) from the USPTO to applicants will also have metadata removed.