Nothing in that wiki page suggests the sword can break unbreakable things. So basically they nerfed Diana's iconic weapons.
I wouldn't hold my breath. WW has been treated very poorly in rebirth, with underwhelming power level. Cheetah has an even worse track record. Getting beaten by street levelers many times. What gives us any reason to believe they will start respecting Cheetah now? Plus Cheetah beating a rebirth WW that is not very strong in the first place doesn't do much for Cheetah's reputation. And making WW's icon gear breakable doesn't help WW either.