The title is factually correct but it's not very representative of the actual content.
A more appropriate title would be NASA confirms predicted levels of organic carbon in martian soil and long term measurements help scientists identify possible cyclic releases of methane on mars.
Organic molecules are common as hell in space including fairly complex ones, asteroids, comets and space dust are rich in them as well as many other "complex" molecules like ammonia based ones are also everywhere.
Hydrogen is the most common element, Oxygen is the 3rd most common one, Carbon is the 4th and Nitrogen is the 7th and Sulfur is the 10th.
Hydrocarbons are common, ammonia based compounds are common, heck cosmic clouds of sulfuric acid are common.
At this point the main study in Cosmobiology is to figure out how to look for life in an organic rich environment since the amount of it in space is essentially blinds us and effectively made us throw out all of our assumptions out of the window.
So what we left is to either try to identify some cyclic processes in these organic rich environments that cannot be explained by any other means (e.g. the methane, although more likely than not it's tied the temperatures during the summer one way or another).
And look at the inorganic and complex organic processes such as minerals that may indicate life and the search for much more complex organic compounds like uric acid and urea since we've identified microbes, fungi and other types of life with uric acid and urea pathways where's it was previously thought that only vertebrates (excluding fish) and mammals (respectively) had these pathways.