@th3j35t3r nevermind, https://www.quora.com/If-your-account-on-Twitter-is-private-can-people-you-reply-to-see-your-Tweets seems like it always has been. I would say tell him if he really cares about transparency and fairness that he should give people more flexibility to be transparent on their own terms and fix it but he would probably just do something stingy like make it an option for twitter blue the way he did for blue check and sms 2fa; in the most tacky, logically unfounded and stingy way possible