Yes, this is true, after months of chasing down a rattle in the rear, and asking "Could it be the Factory Sway Bar Links?" With a NO from a few people "They Only Break".
I went ahead and bought new ones anyway and installed them - guess what no more rattle. Acording to the dealer that the hym joints do wear.
Oh yes, by the way I like the new ones, the top screw is longer than the bottom one so if you have an after market sway bar you have alot more thread to work with.