Personally I don't consider his image proof either, but I don't think a high compression JPG is proof of anything...if it was photoshopped then is would have been done in BMP quality; no distortion. Heck, even making an app that does nothing except return the text would be extremely easy.
echo Self Type: lv0
echo SDK Version: 3.73
echo File successfully decrypted!
...and that isn't even code; it is just batch.