I am learning a piece by Chopin called Polonaise on the site 8notes.com. The problem is that I cant seem to find the real version of the song on any other Chopin website. The piece is simply called "polonaise" on 8notes.com.

I haved listened to all the Chopin midi files that I can find on the internet and all of his Polonaises but I cant find this one. I am going to paste the link to 8notes.com and I would deeply appreciate if someone could browse over and play the midi file (it also has the sheet music) and tell me which Polonaise this is an arrangement of, or if it is one at all.
The link is the 9th piece down. It has the pdf file, the scorch file, and the midi file. Please just play the midi and help me figure out what this piece is an arrangement of or if it is an arrangement at all.

Thanks to anyone who can help.
EDIT::Sorry I found the link to the midi file itself. If you dont mind give it a listen and see if you can tell me if this is an arrangement or the real piece. I notice that all of Chopin's Polonaises on other sites have different numbers and this one is simply "Polonaise" and that is why I am confused

Here is the link.
https://www.8notes.com/school/midi/piano/chopin_polonaise.mid