No, the snippetbot's been around for ages. Well, long enough for me to ban it anyway ;) In spite of its name, it never picked up anything but the front page plus favicon.
:: detour to re-check ::
First sighting (by me), 29 March. Still comes by periodically to eat a 403. If you lock it out, it doesn't ask for the favicon. (Pretty droll in my case, because that wouldn't have been blocked.) I think it was its persistent snuffling around my test site-- which is 100% roboted-out-- that got it banned. Don't think anyone ever figured out what it's supposed to be for.