You are correct and glad you spotted it. I'd hate to be responsible for passing on incorrect information.
I copied this info from just one of many sites, just to confirm what GS stood for, and didn't think to verify that every other acronym listed on each site was correct. Looking back, this was the only one (could be others out there though), that posted they would not take KP stamped items. Makes you wonder where they got their info from....... gold exchange industry, or just googled it themselves? Good example of how misconceptions occur. I wonder how many people tossed away perfectly good jewelry because this vendor told them KP meant plated.
Here's an answer to "what does 14kp stamped on gold mean" from one of the more popular wiki answer sites.
"PLUMB GOLD A term used to describe gold jewelry that contains the precise amount of gold in the alloy that the Karat mark indicates. In the past an item marked 14Kt could legally have been 13.5 karat and still considered 14K. Today an item marked 14k must be at least 14 of 24 parts fine gold and is considered plumb gold. In some instances manufacturers have marked their jewelry 14KP meaning plumb, but inadvertently have confused the public that believed the 14KP mark meant gold plated. "
