The link appears broken, but heres my answer below :)
You can run ADF on a Forms Domain, but I wouldnt - especially because of the version of ADF your app was developed in. Although I can't speak for Oracle, from my experience, Oracle support and certifications are pretty strict on these standalone fusion middleware installations like Forms/Reports - I wouldn't be surprised if its not certified.
Basically, Forms/Reports installs its own ADF binaries on the middleware home in order to run the Fusion Middleware Control application. I know on my Forms 18.104.22.168 installation, it comes with ADF 22.214.171.124 - you can look up the ADF version in the xml/config files in the weblogic installation of Forms/Reports. I developed a quick test app and deployed it to a separate Managed Server in my forms Domain and worked great.
However, since you're using ADF 126.96.36.199, I would just install a separate middleware home with ADF 188.8.131.52. That would be the best and most certainly an oracle certified deployment.