I tried getting through that very long article, but I lost interest already in the very first few words - when reading that the originator was ostensibly one "Herr G. Heim", which can be translated to "Mr. S. Ecret", clearly a fake name.
That's intentionally part of the article that's explained later on in it. Part of the value of reading the whole article, or at least skimming it all.
They bury the lede with all the stuff about Sappho, which is cool and all, but the article doesn't get on topic until about 1/2 way down.
Great article!
Book reader community.