This is not track specific, it was rather a general message to let everyone know that you still have plenty of time, so take it easy
Be aware that though you can upload only one track per user, you can always re-upload your track if you decide to modify it before the submission date ends. As always it's recommended to make your remixes to sound as good as you can for the remix-competitions here, so take the time to polish your work.
Happy remixes to all & good luck to everyone !!