Reread the article, and there wasn't a single mention of the PS3 at all... It was just assumptions made from the press, because they misread/mistook what Bioware said.
Mass Effect 2 isn't coming to the PS3, it was just a misread rumor. Bioware only meant that Mass Effect would only be a timed exclusive to the 360 and would be ported to the PC... not the PS3. Bioware is only concerned about the 360 & PC, and already said many times that they wish to keep it that way, even in a personal video Q&A from the creators towards their community boards (after being bought by EA).