Language is not controlled by dictionary writers. Dictionaries are descriptive only, they just list what words people are already using. In some countries, central organizations do try to be prescriptive and decide how the languages should be spoken, but that doesn’t usually work.

This problem is not AT ALL about the geometrical shape of the expansion of the universe. It’s about 2 different formulas that should give the same result for the rate of the universe, but give different results. I don’t blame you, the article title is extremely misleading.