Yeah, that's probably true. If my time zone calculation is correct, his post was up around 9PM local time. Since the full moon rises at sunset and sets at dawn, and sunset is pretty late at Wals' latitude at this time of year, the moon was probably pretty low on the horizon, shining through the somewhat-less-than-pristine British skies. (I initially assumed that Wals' statement that he was "up late working" meant he was up significantly later, which would put the moon pretty high in the sky.)
Still, it's a fun excuse to quote prophecies of doom.
Um, you do know that moon rises do not necessarily coincide with sunsets, don't you?