My take: they are not bots, but actual human beings reluctantly taking part in a troll factory.
In this thread, I'll cover the specifics that really stand out.
THREAD:
This number is 18.2% for the control group.
This is reasonably expected because mobile app usage is much higher than desktop browser usage for social media.
52.2% of all their tweets were retweets.
The corresponding number for the control group was less than 1%. This will need further study, but IMO it won't go beyond 20%.
Mean follower count: 2.1
Mean following count: 2.8
Mean tweet count 14.7