No. Does the guy not know that docx files belong to Microsoft Word and he could simply open and edit the file there?
Suggest watching the video before commenting. He's coming from desktop OS so, for example, on MacOS, Google Drive can open and edit docx files all through the browser without any additional apps. Additionally, you can fill out a PDF form like IRS 1040 and even sign it all within Edge browser for MacOS that you can't do on iPadOS.