I believe that's the theory. I never had any issues with it and the threads on the trunnions and uprights were fine when I replaced them - I just wanted the peace of mind of the trunnionless for the 10CR
The one-shot grease is described as:
STC3435
One shot gives ‘filled for life’ protection
> Formulated for all leaf & coil spring Land Rover, Discovery and Range Rover models - 1951 - to date.
> Lubricates swivel pins and housing seals, protects spheres.
> A semi-fluid grease designed to withstand shock loading in oscillating joints.
> Reinforced with solid lubricants, highly resistant to water and salt corrosion.
> Better lubrication while driving, less leaks while standing.
> One shot gives ‘filled for life’ protection.
Land Rover originally specified ep90 for the swivels and it was "superceded" by this stuff.