Here's a summary I made a couple months ago of Dans posts on the issue:
He had a couple Tumblr posts on it… before he nuked his Tumblr due to constant attacks from his Co-Optional Podcast guest-staring. Let me see if I can find some archives of those posts…
Here's his two posts directly addressing his stance on the GG issue. Heres another post he made shortly afterwards attacking the aGGros use of Trump Cards, and a follow up where he was noting all the negativity he was getting from KiA about said post. One of his last posts before nuking the account was tearing apart Polygon. And, as a bonus, here's him attacking a Guardian article near the start of GG, as well as a critical look at Depression Quest (in two parts). There might have been more, but that's what I can find archived. Enjoy!
EDIT: There was also Mattgate, in where his community manager was yelled at by Yogscast for asking why they weren't properly disclosing paid videos (i.e. AC:Unity). Lots of mudslinging between Nerd3 and Yogscast, and TB joined in support of Nerd3 at one point. I believe it cropped up here briefly, and the latest Yogscast/TB friction has brought it back up this last week.
There are a couple other posts of his that are tangentially related, but those don't contain much actual content. I'm also not sure if he's said anything much about it on Twitter, as I don't use Twitter all that often.
He's probably made some other comments about the whole thing since then, not least of which an AMA over on Kotakuinaction, but as I don't use Twitter, I don't see much of his random ramblings.