In my limited research on this, I believe Dixieland Delight was banned circa 2014. My son, who didn't step foot in BDS until 2016 is fully aware of the added lyrics by the students so any thought of waiting for a new crop of students that don't know the additions is not realistic.
At LSU, we have our own banned song, "Neck". One of the things that made it great was it was the band and not piped in music. You can youtube it to see what the STTDB stands for that our students added. It was "banned" in 2010 or so, but occasionally makes an appearance, like last year when Odell Beckham watched a game from the student section and told the band he would pay the fine, so they played it. Our stadium rocks when that song is played and we went so far as to have players beg the students not to chant the vulgarity. LSU distributed literature requesting we keep it clean. None of that works with 18-23 year olds.
It's a shame that two awesome bands, MDB and The Golden Band from Tigerland, are no longer the centerpiece of the game day experience. Now, let me go yell at someone who is on my lawn.