Earlier quoted context omitted.
The article specifically argues that the retweet button causes problems that manual retweeting didn't, and so he did invent the thing that's actually a problem.
I think I understand that argument, but I'm not convinced that it's really all that true or that the actual button being added to Twitter was all that consequential. Is a manual task like copy/paste and writing quotemarks really enough "friction" to reduce what seems like a pretty natural human drive on social media? Would doing it over and over again not make it just as "automatic" as a single button push for power…
It seems like they saw an immediate change in behavior and results, enough to conclude the button directly affected behavior. My anecdotal experience was similar. Though I agree we will never know how effective would have been the third party tools or how much the delay in third-vs-first-party development would have affected Twitter’s growth.