People keep saying it because to a great extend it is still very true.
Heritage started in about '84-'85 so they shouldn't be THAT old.
I saw some photos of the workers there and while not all, about 1/3 to maybe a tad less that half were if fact quite old. Of course there were younger people as well but they were undoubtedly trained by those same people. Mosth of these people should be maybe around 50 or so (although there WERE a couple that seemed to be a decade or two older...).
I have never really been a LP fan so I haven't had extensive knowledge about them but my favorite shop carries Heritage guitars so I've tried some out on occasion.
They played great, sounded GREAT but what made the biggest impression on me was that these guitars felt really "real" if you can understand what I mean.
Non-plastic. like there was almost no machine or any other stream-lined production method in their creation. A really distinct feeling of the touch of a human.
(I'm not saying there were no machines involved in their creation, well you should know what I mean)