It's not just Agile but the same applies to DevOps.

DevOps is a culture. It can also be the specific subset of highly skilled individuals who were part of or an outcome of said cultures cross pollination. Today DevOps most often means fairly unskilled person hitting pipelines with hammer.

In the end, the same old people with the same old commercial interests adopted the term in a way that benefited them but changed the meaning of the term because change was not actually something anyone wanted.