From the initial post:

'This build is not compatible with "vanilla" Wine, so installing this custom package will uninstall any existing Wine installation you have. Back up your current WINE folder to be safe.'

http://www.iheartubuntu.com/2012/11/netflix-on-ubuntu-is-her...

<edit> A peek in Synaptic shows both wine 1.4 && wine-compholio installed. Perhaps the PPA resolved the necessity of the uninstall. In the interest of public safety, I would definitely back up before proceeding.

It looks like it installs a separate non-conflicting package called wine-compholio with the necessary patches, and leaves your current wine installed. I don't really have any current wine apps to test against, but you should be able to try and uninstall everything to get back to your current set up.