His last visit date shows as N/A same as others who have left (last posted 5 days ago)
His absences are usually without notice. That's the way it's been for years.
ETA: The last visit date isn't displayed for anyone using Invisible mode.
he usually still posts IOTD though
UT usually takes over IOTD and is the one who informs that xoB is on "vaca."
I got an email from him as recently as yesterday, so he's still kicking, at least...