I think this sheds too much blame away from major news media outlets, whose whole job _should have_ been to fact check the stories they hear on the "ground" (twitter). But it assesses twitter's role correctly.
The piece I think people forget is that twitter has absolutely no financial interest in solving the "misinformation" problem. Fake news drives engagement. People like and retweet everything, regardless of if its true. Twitter is a key tool for the media (and I suspect that's where the vast majority of its value comes from). It's at the centerpiece of the news cycle now. Twitter is great for short, digestible snippets and one-liners that the media (and fake news) thrives on. At every level, they are incentivized to drive "engagement" and this can mean at the cost of truth.
Nothing will change (significantly) until twitters bottom line (user engagement as a proxy for ad money) changes.