You're missing the core. He wants Twitter to be a functional and inclusive town square for public, and world wide, discussion.
There is the bot and manipulation problem. Which is deeper and more extensive than anyone seems to really believe. Frankly, I'm not sure how anyone solves this without pretty stiff vetting during on boarding. Any community that provides free signups is going to have bot problems. Period. Facebook is losing this war. So is Google.
I think he should punt the prevention of AI data scraping as not worth the cost. But it's value he is leaving on the table if he doesn't, though I think this one is detrimental to the users. Put it in the EULA or content licensing or where ever and be satisfied. Don't throw it in front of your legit users.