I don't think that the "Legacy Puppy Section" should only apply to official puppies because it is usually the case that Legacy versions of puppy (e.g. Precise) have been maintained by others. For instance @jrb produced (Precise Light), @rerwin produced (Lucid Revitalized), @ttuuxxx produced "Classic Pup", @darry19662018 has upgraded some legacy puppies. For instance he updated puppy 4 to make AnitaOS and I think a jessie version of puppy.
I don't think any of the puppies that I mentioned above are official (but I could be wrong) but Lucid revitalized is in the legacy puppy section. I posted a thread about puppy arcade in the Legacy Section but it got moved to the beginners help section. Perhaps this is because Puppy arcade isn't an official puppy.
A Legacy section could have subsection broadly categorized by puppy versions.
I bring this up because I have a recent interest in updating some legacy versions of puppy. In part I suppose for nostalgia and learning about how things use to be done but it might also result in a smaller version of puppy for a particular application.