At the end of the article, Dan Woods says...

“Oftentimes applicants went to Stanford and have a masters in computer science, which is impressive on paper, but I was more inclined to hire somebody who doesn’t have any degree, they’re entirely self taught and learn the science because they love it, not because they’re graded on it,” he said.

“One of the questions I like to ask is ‘how many computers do you have?’, and if they say one I’m less interested. But if someone says they have nine, that’s a far better indication of passion for the trade than getting good grades at Stanford.”

This was my experience. I hired two programmers that had just left Boeing that had degrees in computer science. They were tasked to white some custom drivers to support manufacturing equipment. After six months of no progress, I let them go. I ended up writing the code myself, at home in the evening over the course of about a month.

That's a little excessive, but it's sure as hell more than 5%. 80% between bots and alts might be closer to reality. I remember the great NPC initials purge a few years ago.

And the remaining 20% are NPCs.

Archived article (archive.ph) (linked one is behind paywall)

all he really needs to prove is the bot numbers are well above 5% and twitter goes broke

Absolutely true. The biggest problem with Twitter is that they'll close your account over something stupid that you didn't see a problem with. Which means if you make an automated account, that just curates content, posts links, etc you have far less risk. Twitter's strong handed moderation of topics that people are enthusiastic about, like politics, has created a platform where people are afraid to create content for it. There are a lot of left wing trolls who will try and reply to you and instigate you into doing something to get you banned, if they don't like what you're saying, which happens to be anything right of communist revolution.

Using Twitter the way it was intended is terrifying, you're constantly afraid you'll say something someone disagrees with, some far left nut will report you, and a far left mod will side against you. I have automated Twitter accounts for promotion, I never even sign into them or respond to anyone because it's terrifying if you'll say the wrong thing and get banned or you'll find some crazy as fuck liberal. Their moderation policies have destroyed Twitter and it'll never be fixed.