One of my co-workers who hates me dearly has told me that he has used GSA to create 300k backlinks with my main keyword as anchor text. He says this will create a negative impact as google will see a spike in links. My website is only 2 years old and I rank on top for most of my keywords. Would his negative SEO campaign be successful. P.S. I have ranked in the past using blackhat ways but have never been caught. My current SEO guys created a form website for me 2 years ago from where they have thousands of links to my main site. All in all, will his blast of links hurt me? Please be honest.