Yes, no or maybe. It is a stress crack, but it's right about where blades and crowns are joined. It isn't rare to see some flex there and a crack form in the surface layer that doesn't affect the structure itself.
I tend to be conservative where forks are concerned since the consequences of a structure failure there are about as bad as possible. But there's a very good chance it could be OK. It would take a more detailed examination to make a reasonable assessment. So either have someone competent look at it, or err to he side of safety by replacing it.
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