The behavior I’ve observed is consistent with the article, in that the timings of their flood of retweets could very well indicate a real human pressing the buttons, and I suspect they are. And, it does not surprise me that when looking at the long tail of the most absurd fake news that has a small audience on an individual tweet level, that one would find the majority of the retweets for such obvious fakeness is coming from such blind retweeters.
The effect overall is that whatever bubble such users are in gets amplified a bit, absurdity and all, though I’m skeptical they play any role at all in what becomes truly popular.
The real problem is far more nuanced with the less obvious fake news that even those not tapping blindly are taken in by, the less obvious fake news that gets a large audience because a lot of people find it believable, hoaxes that persist in the collective unconscious long after their time in the spotlight has faded, regardless of any debunking or fact checking that played a role in its popularity dying out.
I think the effect of these super spreaders repeating complete nonsense is minuscule compared to the effect of organically popular almost reasonable nonsense that truly goes mainstream.