Van Smith has confirmed with AMD that the issue is real. This site has been detailing the issue since late 1998. The site also contains the necessary resources to determine if your AMD chip is affected.
Judging by the AMD statement, this QA shortcoming may have existed for quite some time, since the K6-2, Athlon, and Duron are all named. Oddly, the K6-3 isn't mentioned. It's also pecuilar that this problem has gone unnoticed for so long. I suppose if a problem is small enough, it's hard to notice the trend. After all, everything mass produced typically has a lemon batch here or there.
Thanks for the heads up, Rand.