I agree, It has nothing to do with Reddit. It's all about how Digg managed, as if by miracle, to scuttle its own boat in a few hours.
Digg didn't feel like Digg anymore after the change so I looked for something that felt like digg and found Reddit. It's obviously not the same and there are things that almost make it unbearable (I love the analogy that Reddit is 4chan lite) but I'll stick around there until something better comes around.
It has a lot to do with Reddit in that Reddit was available, better, and already fairly well known. It's not like the article could possibly go "How Digg's Whatever Benefited Mixx.com". Reddit was basically standing there ready to soak up Digg users once masses of them stuck their heads up for long enough to notice that Digg isn't really that entertaining or informative, and other sites may suit them better.
Digg didn't feel like Digg anymore after the change so I looked for something that felt like digg and found Reddit. It's obviously not the same and there are things that almost make it unbearable (I love the analogy that Reddit is 4chan lite) but I'll stick around there until something better comes around.