Are you doubting the word of someone who has actually looked at your 4runner?
If he says its broken, fix it and the problem will go away.
Why would you doubt what he had to say anyway?
He probably meant to say sway bar link. But have the alignment shop fix it anyway.
I have no doubt that it's broken, but not sure if there is a direct link in it causing the swaying.
He didn't say it caused the sway, rather he couldn't do the alignment b/c it was broken.
A broken tie rod or tie rod end would send both wheels violently in different directions. You wouldn't be going anywhere at any speed.
If the guy meant sway bar link, I call BS, because you don't need a sway bar to have perfect alignment.
Either you're confused and aren't remembering what your mechanic said correctly, or you need to find a new shop.