It's unofficial because this build isn't fully functional yet. It will become official(Registered in LineageOS official website) only when the devs got all if not, most of the functions(cam, audio, etc) working and major bug squashed.
Well, it's about time to put a disclaimer on this method. It simply doesn't work. Device encryption (at least of /data partition) is a very important Android feature and is now mandatory for OEMs... If you follow this guide and re-enable encryptio...
I suggest you to take a look at "Samsung Nougat and encryption" here: https://plus.google.com/+Chainfire/posts/XikxTkhHpiG
(spoiler: no good news for a Nexus user)
Thanks for pointing me to that interesting thread.
That thread clearly shows s...