It seems more likely than not, really.

[As for that question, he scoffs before taking a drink. He's not exactly a spy, you know!! But he's close enough, so yeah, alright.]

I'd be shocked if he didn't. I asked him if he was keeping track of us all the time and he said he wasn't - so it seems very likely that someone is giving him information about what we're up to. It may just be the fairies - with his magic, who knows what they're capable of - but planting one among us seems to be in line with his general sense of humor, ja? He'd likely enjoy that reveal.