Yes, this is just another IW4 dump. But with a bit of a catch. This dump also includes SP weapon files, all SP and MP ,ENT files, as well as GSC and .ENT of the new maps that where included in IW4x (for those people who don't know how to open an IWD file).
Sadly, there are only two public dumps of menu files, and both of them have their own issues. If someone would be kind enough to create a PR that includes the corrected ones, I would highly appreciate it.