Pretty sure that is not true, I beleive silca gel is carcinogenic, at least I was told that once.
However, he said oxygen absorber, which is not silca gel. Silca gel is for absorbing moisture. So it may be nothing, or may be something, in such small doses I'd say nothing.
If it were really serious they would not be able to sell the stuff as is. I'm sure this happens all the time.
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Just edited post, SDS says not a problem