It is not, unfortunately. It's missing plenty of proprietary middleware etc that you need to run it on Nokia phones.

IIRC you are supposedly able to build and run this source dump on some BeagleBoard.

I was there, coding multimedia stuff for the last generation of Symbian smartphones. I remember this dump was originally released on Gitorious (later acquired by GitLab) some 10++ years ago.

Fun fact: the source was originally supposed to be licensed under a different roll-your-own open source license (I think it was named "Symbian Foundation License" or something like that) but Nokia switched to Eclipse Public License 1.0 before the public release.