Old service letters-mod IV 1994 vintage

In looking over old service letters I found one on the rudder cables. Thinking I was in the clear, the last paragraph says to change the cables three years after install. What the heck. Is this something that has to be changed out every three years even if you go to stainless and coated sleeves? It's not very clear.

No, it is a one time fix when you put in the proper sleeves and cable combination. The issue being addessed here is dissimilar metal corrosion.