EDIT: Just updated the game with this mornings update, sound is still working, so try the update first!
That is the link to the Windows 8 fix, which I tried and does not work. Also windows 10 already has a XAudio2_9.dll, and unless you do some interesting permission changes to your windows directories, you cant delete or overwrite those files and doing so may cause more issues with your system! Attempting that fix actually broke audio in other games.
Good news! I did actually get it fixed! It appears this update may have buggered some windows 10 users dx files somehow.
I downloaded the DirectX End-User Runtime Web Installer from here : https://www.microsoft.com/en-ca/download/details.aspx?id=35
I was getting errors trying to run the launcher, so I changed the location of my Temp and TMP folder to the root of my C: drive, here is a link on how to do that : https://www.howtogeek.com/285710/how-to-move-windows-temporary-folders-to-another-drive/ (remember to record the original location so you can change it back later if you want to)
After changing my temp files location, I was able to run the dx installer without issues. This install can take a while, as it requires a good sized download of legacy DX SDK’s
After the install finished, I rebooted my system and I had sound again! Hopefully this will work for other people.