The problem you describe, of the double meaning of the term “racism”, is very real, but only among white people. When communicating with a Black CEO, you can safely assume that they understand the true meaning of the term, from experiencing it every day. And as a result will appreciate the admission and apology. The second mistake to avoid is to not expect a medal, so to speak, for doing the bare minimum. In my experience that is a common pattern: demonstrating a basic understanding of systemic racism, then expecting to be treated as a hero for it - then being disappointed when we’re (understandably) not. Sometimes this can be quite exhausting to someone targeted by racism, because it adds to their mental burden instead of lightening it.