Remember, "organic" means "contains carbon" (to a first approximation), not "alive". Earth is well-known not to have anything like a monopoly on all the carbon in the universe. We've never had solid evidence of life on other planets, so this is no change there.
It also raises another possibility not mentioned in the article, which is that life is in fact rare, the only life anywhere near us is what developed on Earth, and discovering life on Mars or the other possibly-hospitable locations in the solar system may not prove that life is common if it can be shown to have derived directly from Earth life.
It also raises another possibility not mentioned in the article, which is that life is in fact rare, the only life anywhere near us is what developed on Earth, and discovering life on Mars or the other possibly-hospitable locations in the solar system may not prove that life is common if it can be shown to have derived directly from Earth life.