Language is power. It is simply a power grab where people invent new language and initialisms intending to claim ownership and control of them and use them as a tool to, like you say, exclude people.

DI became DEI became DEIB in less than a decade. They are working on new initials as we speak, to confuse and demoralize anyone who opposes this make-it-up-as-we-go-along sophistry. Inventing all of this language infrastructure around what used to just be the Golden Rule is clear nonsense.