Even if the factor is off by 10, it's already too much chemical exposure. Also EPA limits can often, due to industry pressure, be set way too high. So better be save and throw away that spatula, which actually this article also reiterates.

==== From the article:

“However, it is important to note that this does not impact our results,” Liu told National Post. “The levels of flame retardants that we found in black plastic household items are still of high concern, and our recommendations remain the same.”

So if you’re keen on eliminating these chemicals in any amount, chucking the black plastic kitchenware is a start, even if not as effective as the erroneous calculation suggests.