I think this is nice.
Many stations had dedicated Club Agents that were trained in premium service, I think they should have some distinction. Of course, not all stations have Premium agents staffing the clubs at all times (especially during meal relief, etc.) so it probably won’t be something to overthink if you see an agent in a blue/silver tie.
On a separate note, it’s interesting that it’s 2021, and they are expanding the Gold, when we were supposed to have new uniforms without any gold in 2020. (I personally prefer the old/current uniforms, though!)