You are right, the links are broken. See attached. Note that these kexts are not checked on Sierra, I use 10.11.
The procedure is basic:
1. Config.plist / Devices / Audio / Inject = (Audio_ID) 1
2. Place HDAEnabler3.kext in /Others
3. Disable SIP + Restart
4. Replace original AppleHDA.kext with...