But that's not changing. The free plan retains unlimited private repositories. The only thing that's changing for free is the amount of time they can run CI for free.
As noted in both the article you're commenting on and their (linked in that same article) product[1] site that lists the different plans:
FREE
2,000 CI pipeline minutes per month
Unlimited private projects and collaborators
[1]: https://about.gitlab.com/gitlab-com/