Absolutely, the previous design tenure of 10 years is quite a feat. There are very few websites that can last this long without feeling old-fashioned.
I'd personally disagree, if only because the actual text space columns were so thin that it made everything I was reading feel very, very busy. It took me weeks to get comfortable regularly going to their documentation instead of looking at SE, even though their documentation was very, very good.
Despite kicking around for just under 10 years, the old Django look never felt old, ugly, or clunky. It had a clean, thoughtful layout with good color contrast and an unmistakable Django identity. To me, it never gained the "cruft" that similarly-aged designs seem to take on. It always felt modern.
Loving the new design, but I would have never guessed that there were plans to ditch the old one.