Yes, that did happen, speaking from personal experience as well. I originally posted that the terms allowed companion Gold once you hit 500 SC's after becoming Plat, when companion membership was first introduced. A few people benefited from this, some were denied and after some debate in the forum Virgin eventually updated the terms to what they are now.
In the year you upgrade from Gold to Platinum, there has been evidence that they give you the companion gold after 500 status credits (i.e at 1500 in the one year) which is before the 800 required for renewal.
(I speak from personal experience )