It's funny because it isn't even true, TechRaptor as a Tech reporting site has existed since early 2013, here is a Web Archive from about a year before "GamerGate" started: http://web.archive.org/web/20131124114156/http://techraptor....

In fact it was founded by Rutledge Daugette in March 2013, over a year before "GamerGate" started in August 2014. So apparently the site was "set up by evil GamerGaters" over a year and a half before it ever existed in prescient foreknowledge and expectation.

What this should tell you both about said claim and the people making it I would like to leave up to you.