Python users had a choice to stay in 2.7 land or make changes to their codebase for not much in return. Many chose to stay in 2.7 land, which you could safely say is stagnant. As a result, if you can't keep moving with Python, where will you go?
Since Python users have a choice to stick in 2.7 and get no rewards for it or jump into new languages that are evolving, they're going to jump into new languages and these same people are going to start saying things like "python is dead" because in their 2.7 eyes, it is dead.
Finally, unless I'm missing out on some serious deadpan sarcasm, he concludes "Don't worry it's not a bad thing" because look at Perl who everyone says is dead.