"Because corn syrup is in almost everything it's hard to know just how much mercury you're ingesting."
I think that's Retric's point, and if it's not his, I'll certainly claim it. There's a little bit of everything in everything (thanks, entropy!). This article does nothing absolutely nothing to inform us as to whether this is actually worth thinking about.
The information content of this article is zero. Without more information it's not even worth your time to think about. (Trying to find more information might be worthwhile, and based on the other HN-posters who actually did that, I find myself fairly unconcerned about this putative threat.)
Japanese studies have shown that chlorella is helpful for removing heavy metals, including mercury. I know people who don't eat sushi without a handful of it as well.
The problem is that even if one dose is below harmful level, 10 doses might not be.
Or 100, what ever the dose is.
Because corn syrup is in almost everything it's hard to know just how much mercury you're ingesting.