I haven't seen it on MOTD or really "official" outlets, but I think a lot of the recent xG discussion was instigated by Michael Cox's piece in The Athletic predicting us to fade:
The xG table: Spurs to fade, Sheff Utd unlucky but Woolwich not in false position
(I kinda expect our results to drop too, but more because our tactics are better suited to the strong sides than the midtable ones who can low-block but also have enough ability up front to cause us problems, like Crystal Palace. We have to figure out how to be better in possession imo before we can start to predict how we'll fare against teams we "should" be beating, because as you can see with this weekend no one's easily beating anyone.)
Maybe it was already in the air much earlier but since that piece I've seen a lot of stuff on Twitter about xG, a lot making fun of it ("we won the xG! hurray") but some taking it seriously to suggest Brighton's been unlucky, or that Arse *are* improving in xG at least despite their horrendous form.