Ok, so I had the wrong information on when this bug was fixed. Apparently it didn't get fixed in the last patch (as you noticed), but will get fixed in 2.1.0 instead.
The change will be that the difficulty of dispelling the rogue's poison is based on the level of the player instead of the level of the weapon the poison is applied to.
That makes sense, but I have trouble seeing how weapon level is ever going to be higher than player level, making this almost look like a nerf on the face of things. I'm sure it's not, though -- anyone want to explain?
In other news, perhaps Blizz took my jab at their web design on Sunday a little too seriously -- they're now on the lookout for a new web designer: