I am not sure about the source of your information but as per official websites, when person applies for two or more certificate option, one of them needs to be of at least three years and other one can be one, two or three years. My professional consultant and WES customer care and experts on various forums have confirmed this.Either way, even if the ECA says that the certification is one year, applicant cannot claim points for 2 or more degrees.
Furthermore, my friend holding a PR had applied as two or more cert and equivalency was bachelors plus completion of college level cert (one year).