Well the linked article dices it up. Make of this what you will.
"All of the above data points could signal fake accounts, describe users who are inactive, or even "lurkers" — users who exclusively consume content. It's likely a combination of all three. However, there are a few further stats that point more to the former two types of users.
Over the years, many real X users have found there are certain attributes that point to an account most likely being fake or a bot. For example, if an account uses the default avatar or the auto-generated username that usually includes a string of numbers, there's a good chance you haven't come across a real, active user.
Just around 25 percent of all of Musk's followers, or more than 38 million, use the default profile image that X provides for newly registered accounts. More than 40 percent of Musk's followers, or just under 50 million, have 4 or more numbers in their @ handle on X.
Furthermore, more than 43.8 million Musk followers follow less than 10 users in total via their X account. Around 13.5 million users only followed one single account, @ElonMusk, at the time the data was collected."