Iirc, it's compounds containing carbon, oxygen, hydrogen, nitrogen and a fifth one that I can't think of defines "organic." It's been a while since I had chemistry >_<
And that article. Tbh it's nothing new and scientist are aware that life could exist that hasn't evolved the way it did on Earth. The problem they face though: How to detect such life if you have not really made a definition on what life is and the knowledge so far about carbon-based organisms can't be transferred so easily.