Hmmm...interesting idea. I'm inclined to believe that surviving a collapse is as much luck as anything else, but assuming it would make a difference, here are my thougths. I can sort of see what they're talking about regarding cars, it is very possible for a car to be crushed down to the level of the firewall and not be completely pancaked, so the "triangle" would exist there, although unless you're in an underpass you're probably more likely to be hurt by flying debris outside your car than you are to be crushed. But I'm not sure I agree with hiding beside large objects indoors. If something heavy falls on my desk, it's either going to be crushed or it isn't, it wouldn't partially collapse, so I'd be pancaked weather I was under it or beside it, whereas I'm much more likely to be hit in the head by the falling light fixture if I'm not under my desk. I also would think that an earthquake would flip that large filing cabinet over on top of me long before it knocked the roof down on top of the filing cabinet.
Having said all that, I think
Virginian's post from a couple weeks ago is applicable here, too. We humans don't yet have instincts for being in high rise buildings anymore than we have for walking through minefields, so what seems intuitive may not be such a good idea at all.