They gave some details here: https://forum.lastepoch.com/t/november-2023-development-update/61455
Seems like they want to shift the majority of enemy power from modifiers and into corruption. They are changing how the damage and healing corruption increases scales as you increase it, giving it a higher scaling when you reach the breakpoints of 100, 200, 300 etc.
It's not actually a breakpoint system, those thresholds were given as an example to show the differences at that point because comparing formula together isn't very intuitive.