https://github.com/twitter/the-algorithm
So clearly they aren't running it in production.
Also they didn't open source the list of people who are being artificially boosted e.g. Elon.
https://arstechnica.com/tech-policy/2023/02/report-musk-had-...
https://mashable.com/article/twitter-releases-algorithm-show...
And personally I never used Twitter much, but I certainly did not follow Elon Musk when I did - yet I had to see lot's of his posts in my feed. Surely just coincidence.
No, and that's not what the article says either. They were just tracking how well his tweets were doing versus others. They were not favoring Elon.
So changes in power users stats would also result in audience balancing?
Most likely the code was used for analytics and for tracking balance; Elon was a pain in the ass and asked to have custom analytics for his account and devs eventually added him as an audience to be able to get analytics about him easily. A bit dirty but it works.
Most likely the balancing code is somewhere else and it affects only republican / democrats.