Would be a good story if there was any fact to it
The copper pin is actually steel with a plated head if he had bothered to look were the tools lift out from he would see the nice shiny steel. In tool manufacture it would never be copper, brass maybe but in this case it is steel. Any threaded fitting does loosen in time if used and not not locked again, if he loosened or tightened it without using Locktite then of course it will loosen as you use it like all screws would, only difference is you can tighten it yourself when/if needed. The altenative is to have locking nuts or star washers both a bulky and costly solution.
Personly I think he has taken it to bits to get his story, that is about as good as his review of Silent Hill. His knowledge of tool maintenance is just right for someone who uses riveted tools and he should stick to them.
When Leatherman does produce its 6 pin torx screws you will find they will need Locktite when adjusted or they will loosen just the same. If he had loosened the screws on the Recoil I think he would have mentioned the plate that is the actual locking mechanism getting loose and jamming so it fails to lock. (The actual locking on Gerbers is a piece of thick steel shoved between the blade/tool and the frame)
Dave