If I'm not mistaken, I think the default program in WFOs that is used to generate LSRs still lists "Marble Size 0.50 INCH," so it's possible that old terminology can still be floating around. Old habits can be hard to break, even among forecasters.
I have just recently taken the Spotter Class here in Alabama. And you are right Chris, that is the old term. It was a point of emphases NOT to use the term "marble" size anymore. So when I hear that now I just roll my eye's and wonder "WHY"?