Final answer:
The statement that 'flavorings in liqueurs are always more prominent than the base spirit' is not true, as flavor prominence varies. The other statements regarding sugar content, Southern Comfort, and cream liqueurs hold true given specific contexts and modern history.
Step-by-step explanation:
The statement that is NOT true among the options given is that 'flavorings in liqueurs are always more prominent than the base spirit'. This is because while many liqueurs are designed with strong flavors, it is not universally true that flavorings always overpower the taste of the base spirit.
A liqueur is indeed defined by having a certain amount of sugar, but the exact minimum content can vary; it is generally recognized as around 2.5% of the volume of the final product, which makes the second statement conditionally true depending on regulatory standards. Southern Comfort is indeed a product derived from bourbon but is not classified as bourbon because it has additional flavorings and sweeteners, making the third statement true. Lastly, cream liqueurs, such as Bailey's Irish Cream, have been around since the early 1970s, which may be considered recent in the long history of spirits, making the fourth statement mostly true.