It was really quite the let down of an article. All that build up, then basically nothing about how adaptive rate limiting would be implemented in practice, how expensive it would be, what it requires, the challenges it involves, etc.
Just click around a bit:
- https://github.com/fluxninja/aperture
- https://docs.fluxninja.com/use-cases/adaptive-service-protec...
Note: I am one of the authors' of this project.