Joking, while giving advice to someone who MAY not know better is irresponsible.
Many of the new guys don't understand the difference. I didn't see it as a joke. Maybe that's because I'm familiar with carnuck's M.O:
Show up periodically and blast answers into every post he can find, accurate, applicable, or NOT.
Besides, carnuck always has a lame excuse for why he did something like this. This time it's joking. Next time it will be something else.
He creates a bunch of work for others as they follow around hurriedly to clean up his messes before some poor bloke takes the advice.
It's not all wrong advice by any means. But LOTS of it is.