[throwhauser]

"To help you fool yourself" seems like a euphemism for "to fool you". It's gotta be tough to go from "scant knowledge of S3" to genuine knowledge if the documentation is doing this to you.

If the docs are misrepresenting the details, who can blame the author of the post?

[inopinatus]

The documentation is very clear on the purpose of the delimiter parameter.

The OP does not read the docs, makes bad assumptions repeatedly throughout, and then reaps the consequences.