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They mean the solid metal stems. You have the stems I used to have which are rubber and have an outer metal sleeve (mostly decorative chrome) and are not as strong as the solid metal stems. The issue is that if you have the extra weight of the sensor on the end of the stem, the metal stems can support the centrifugal and other forces that accompany these sensors and the rubber types might be more prone to stress and cracking and therefore failure.
Like snfexpress mentions the difference is that rubber is being used to seal the stem but the stem itself is metal.
I have since replaced all the tires on the rig and had metal stems installed. Same thing with my truck at the last tire change.
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