Page 14: the TL note for "*grain of salt" is "*misleading." In my experience, to take someone's words "with a grain of salt" means to be aware that they are talking about a small part of a bigger picture, or an honest experience that is something of an outlier on the distribution graph of expected outcomes. I suppose I've also seen it used to refer to situations where you would interpret the speaker's words differently if you knew more about their background and beliefs, but I don't think I've ever seen it used to mean that something is misleading, and certainly not intentionally so. While I am a native (American) English speaker, I am not a professional linguist, so feel free to take my thoughts on this matter with a grain of salt.