apparently the different variants of English don't agree on what "captions" and "subtitles" are.
Probably doesn't help that the closed caption option usually appears in the subtitle menu in most software 😅
But yeah, I think what you're referring to is normally called "closed captions", but I can see how it would be shortened to just "captions" for convenience in some cases.
Lets hope they never get bought out by Nintendo or similar....