Chopin's Żal (Jesienne mgły) - After Etude Op. 10 No. 3?

[cuberdrift]

Greetings all,

I have just stumbled across this intriguing song which happens to be a musical setting using the famous "Tristesse" after a poem by a "Marian Józefowicz":

The author of the above video posted this:

"The words were written by poet M. Josefowitz, long before Chopin wrote this music. Chopin changed the melody himself a bit, so that it went with the poetry. It is absolutely beautiful, written in old Polish. Thank you for listening!"

"This is an information directly from the F. Chopin Society in Warsaw, which gave us the sheet music of this song (set to the poem) in 2006."

So apparently, Chopin himself wrote the musical setting, for voice and piano, and there is a sheet music of it.

The thing is, I have scoured online for the score and haven't yet found the original. It is not in IMSLP. It appears to have been unpublished and does not appear in Chopin's catalogue.

I've also failed to find any mentions of it in Google Books.

What is this piece? What really is the actual history behind it?

Recordings of it apparently dot the web, however. Here's another version of the music recorded in 1933:

Does anyone know about this song?

EDIT: I've found the score: https://pbc.gda.pl/dlibra/doccontent?id=8890

It looks like the arranger is a certain I. Tiumieniewa. As I had imagined, the adaptation does not seem to have been by Chopin at all. Still an interesting find.