To echo, there's no truth in that. Years ago, I was sued by JDBs (West Asset and NCO, then) and lost! Had to pay every penny and then some.
I've heard the same mentioned at one point too. I think people are believing that once it gets to a JDB, the SOL expired. In general, that is usually the case if you live in a state with a short SOL. But in recalling my records, I've had some bad JDBs chase after my debt within SOL.