Earlier quoted context omitted.
Not just America uses dot as the decimal separator, see: https://en.m.wikipedia.org/wiki/File:DecimalSeparator.svg Blue uses the dot, green uses the comma. By population dot wins (since India and China use the American style).
What that map show is that space wins because otherwise someone is bound to be confused.
If someone wrote it in German or French and used the wrong decimal separator, then it's an error.