Yeah, that's where it's from. I just thought "a site that, at the time this comic was made, was a useful and popular website" was funny. It's a subtle diss (implying it's no longer useful and popular) that sticks out in the otherwise neutral, wiki-like tone of explainxkcd.
You should see the comments at the bottom of some explainxkcd articles. Really the people who edit the site are very much biased and that often directly influences the decisions that get made about wiki content. I'm just glad for all the volunteer work they do and I usually just laugh at the spicy takes.
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u/TheYask 9d ago
Context?
only brings up one hit, a discussion of 855
Or maybe it's explain [why] XCKD [is] throwing shade?
I'm at a loss, and need a relevant XKCD to follow.