There is more than a little tongue-in-cheekedness about this document. The fact that it's a humourous slight against Americans (that is, citizens and residents of the United States of America) doesn't mean it isn't true.
More importantly, it's making the point that all communications are fraught with lack of clarity and misunderstanding.
More importantly, it's making the point that all communications are fraught with lack of clarity and misunderstanding.
As this very subthread is evidence.