Whatever the case, the answer he states is wrong was provided by an Adobe staff member (Yachika).
The answer provided by Yachika is wrong for the windows environment, don't know about the mac.
Anyway, I would recommend avoiding using the option to store the edits in the ACR database due to several reasons:
- The infortunate path chosen by Adobe in windows is normally hidden and not well documented in ACR, and you cannot select an alternate location (that's why it is not easy to find it)
- The location is user specific, so if another user logs in and have access to the same folder where the photos are stored, he/she will not see any edits
- User profiles may get corrupted and the common solution is to create a new user
- IMHO folders in the %user%/appdata tree should be used only for customization, caches, temp, but not for permanent, user independent data. I consider Adobe made a wrong choice of location for the ACR database.