AVi K. “The term “Chareidi” to refer to anyone observant was in vogue 100 years ago. Since then the number of labels has grown. “Dati” refers to non-Chareidi frum.”
Which means that the term “Chareidi” came first and was used to refer all Frum people. This (if it’s correct) proves my point that Chareidiism is not a new movement, and Datiism is.