It's not even close to fake news. Logarithmic scales are standard in this kind of visualization. The thrust of the result is that right-wing people share more fake news, and if you look at the graph, this is clear. If you mistake the X-axis as a linear scale, the result makes the effect less pronounced, not more.
So if anything, the graph undersells the thesis in the name of creating a more compact and readable visualization. There is no deception here.
Yes, they are suspected right-wing bots separated from the data-set based on a set of criteria that marks them as outliers.