The hint itself: That's complete nonsense and doesn't improve your security by a bit. The only reason why you might want to do something like this (at work) is

The hint itself: That's complete nonsense and doesn't improve your security by a bit. The only reason why you might want to do something like this (at work) is if you don't want to follow non-worksafe links. And even then - what are you going to do if it's a tinyurl or goo.gl link? Just not following? The attack: This completely misses the point. If a site wants to mess with you it doesn't need a link for that, it can just directly execute Javascript code and do whatever it wants to do.