I think that Twitter actively does not want spambots on their site and therefore would invest into metrics so they know how they're performing on that.
"both sides are bullshitting to get a better price"
Which implies that this number is related to Twitter trying to get a better price. However, if this is the number they have always said, regardless of the methodology, clearly they can't be trying to get a better price - as they started doing this long before there was a price to make better.
That is separate and independent from whether the number is accurate to begin with - if it's remained consistent and publicly available, there's no chicanery here, the risk around that stat has always been baked into the market price of the company.
The percentage of fake users has a high correlation with the value of the business. Twitter's value is higher if the number is lower. I'm not suggesting they just started bullshitting in the past month, just that they are not making the best effort to get an accurate number.
Having zero bots would be good, but obviously that isn't True. So instead they say a low consistent number and hope no one proves them wrong. Most importantly it doesn't appear to be getting worse.
Are you saying Twitter isn't bullshitting? You think that Twitter put in their best effort to get an accurate number?