This posting is older than 6 months and can contain outdated information.
A full list of supported hardware can be found on the Remote Buddy website at
http://www.iospirit.com/remotebuddy/supportedremotecontrols/
The Harmony line of remotes is not listed there and therefore not officially supported by Remote Buddy.
Regarding your Plex profile questions: as outlined in the answer to your post in the other thread, you really should use the standard "Apple Remote" profile for testing before trying anything else.
The Plex profile may be perfect for Plex (and that's ok), but it contains errors (which I explained many times before in this forum) that make it unsuitable for general purpose usage. I don't know what codes it contains for its "PowerToggle" or "F7" codes and whether these are Apple Remote IR codes.
The "Apple Remote" device profile on the other hand only contains valid Apple Remote IR codes.
Best regards,
Felix Schwarz