When you sign up you get one free track (so this didn't cost me anything)
Here is the Order Screen:

It clearly shows I'm ordering the MP3 (you could also order wma)
Since I use FireFox, I had to download a tiny "PureTracks download Manager". It did the file transfer.
And here is what I received:

So it is in wma! But it is NOT protected (no DRM).
I can play the file in Media Player Classic, but I don't have the wma plugin for Foobar.
So it looks like a half truth - the files don't appear to have DRM but ar NOT MP3 as advertised.