Reese covers that, it was an edit made from the 1935 editions to the 1954 (or '58) editions, where "there were no people, only Indians" was changed to "there were no settlers, only Indians."

I'm still working on how the former was acceptable even in 1935.

Fortunately, there area lot of "pioneer days" stories being written these days, some by Indian writers, that aren't "authentic recollections" like the LHOP books, but aren't bonecrushingly offensive, either.