It really is...I’m a big fan of vintage cooking and cookbooks and as far as I can tell “ranch dressing” is a screwed up corruption of the old-fashioned tart sour cream salad dressings (basically sour cream thinned with lemon juice, and herbs).  Over time the tartness was eliminated, a bunch of sugar and artificial junk was added, and we have the “ranch” abomination we know today.