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.
You know, my message board nerd instincts tell me I should attempt a grasping litigation of this point, attempting to establish for my faction the notion that TechRaptor is in fact a GG spinoff. But, you're right: I did some research, and while they are beloved of GamerGaters and the KotakuInAction crowd, that doesn't make them GamerGaters.
I retract the implication I created upthread that TechRaptor's story is weird because it's a GamerGate product. I'm back to "it's weird because I don't know why".
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.