When we say "simple", we use it as a way to say "not complex". If we want to say "not hard", we say "easy".
Words should be used carefully or we end up with no word to say what we mean. That's why there's literally no word meaning what we want to say by "literally".
But from context you can determine whether "literally" means "literally" or "figuratively". It's the same with "simple", you should assume it means "simple" and not "easy" in the case of a documentation where words are chosen carefully.
...yes it is? The word has multiple meanings.
> free from complexity or difficulty [https://www.merriam-webster.com/dictionary/simple]
> involving minimal difficulty or effort [https://www.merriam-webster.com/thesaurus/simple]
etc