I'm sorry, but the internal evidence is that Twitter's internal bias is
not left-leaning. It took a storm of complaints and publicity to get them to punish Infowars, for example. There's lots of anecdotal data that has Twitter punishing minor infractions of left-leaning users harsher than major infractions by right-leaning users.
This looks like an elaborate excuse to give conservative/fascist opinions a little affirmative action.