For a starter, I hate been redirected out of forum to go read some article, if you're the original owner of article then post then on forum and you can add a source link at the end for reference purpose or indicate you're the original owner of article to avoid been accused of plagiarism.
I guess that he is the real writer of that article based on the name of the writer at medium. I also guess that he should have write a little bit of context of what he wrote on that link in this forum and on his OP. I think that he's just wanted some clap for his work.
I don't think it's wrong to paste article here for more discussion or exposure, imagining you are an author.
It's you yourself deciding whether to clap or not, based on how much you like the post.