That's about all the developers who participated in the Jam, and I doubt he's slept with all of them. Moreover, the video's claim is that Grayson gave her game favorable coverage, and this great injustice is what started all this. Which, as Frank pointed out, isn't true.
I am barely following Quinn or the claims about her. I just happened to know that's one of the articles that people point to when they call "bullshit" on the "grayson slept with quin after he wrote about her". Based on the alleged timing, things do look a little fishy there. And while it was an article ostensibly about "all the developers" and not just Quinn, reading it just now I note:
Zoe's name is mentioned 8 times in the article, sometimes as Zoe, sometimes as Quinn, sometimes her full name, and twice as "Depression Quest creator Zoe Quinn".
Adriel Wallick is mentioned 3 times. No mention of her game(s).
Robin Arnott is mentioned 3 times.
JonTron is mentioned 4 times, but mostly in a paragraph detailing how he and Zoe Quinn were butting heads.
Even when named, most of these people only got a passing mention.
You know who wasn't mentioned by name? Russell, Ben, Yuliy, and Tom (the Arcane Kids). Nor are the "group of USC students" who were in the jam. Any of the surprise YouTube personalities (besides JonTron). Any of the other "16 competitors in total, divided into four teams."
There is a strong focus on Quinn in the article. After reading the article, the only person who I could be sure of who they were was Zoe Quinn. And wouldn't you know, the article ends with a two paragraph (nearly 12% of the article length) kumbaya quote/advertisement from Quinn about how she wants to start her own game jam and be a steward and ambassador for indie games.
I think people can be forgiven if they think this article's a bit of a Quinn puff piece.