It means that their "bots are only 5% of users on Twitter" that they use to say how much of a userbase it has to their shareholders is based on a sample size of 100 users. Which means they're lying, and not only lying in general to the public but also lying to their shareholders in a manner that could expose them to legal action for fraud. Reason being, they tell shareholders "Oh we have 200 million users and only 5% are bots" and shareholders make financial investment decisions based on that metric, since users are the main source of revenue for Twatter (seeing ads). If significantly more than 5% of users are bots, that means their platform is significantly less valuable than they claim since the ads that companies are paying for are being seen by a LOT fewer real people than they're intimating to their shareholders. This is fraud and the SEC can ream them for it.