Not true at all. A quote taken from
@Jerry Bransford:
Death Wobble would
never be an obvious sign the steering stabilizer is bad because a bad or weak steering stabilizer is absolutely
NEVER the cause of Death Wobble. Neither is installing a new Steering Stabilizer EVER the cure for DW. A new SS may temporarily suppress the symptoms of DW confusing some into thinking it cured it but when the SS weakens a tad, the DW will return. Kind of like holding a gorilla down... you may hold him down for a short period of time but eventually you'll get tired and that gorilla will be back in your face.
You can run without a steering stabilizer and not get DW if your tires are well balanced and the suspension/steering is in good condition.
The way to know when a steering stabilizer is bad is when after you remove it for testing, you can easily push it in & out. It should resist enough to require a lot of effort to compress or expand a SS. And 99% of all steering stabilizers are hydraulic so they will not not try to expand out on their own, they will stay put at whatever position they're left at.