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This is a 100% NO NO. Its black hat. This site is selling links in articles to try to game Google, this will be flagged as a paid link by Google bot and possibly have a negative effect on your site. Don;t do link building like this unless you want to end up in a Penguin penalty, it takes years to get out of a penalty. you have to fix your problems, then submit a request to Google once they release you. You then need to wait for the next refresh, so far its been just over 1 year since the last refresh! If you are looking to do some link building I would look at outreach, Google it and learn how it would work for you there are some great guides around.