I do not consider this a technicality. I think technicality would be if he actually made a claim for US citizenship, but the authorities made a mistake while trying to persecute him and that is why could not persecute him.
Here the situation looks different. He has never made a claim to US citizenship (even though he might have wanted to make this type of claim, and even though he might have full intention to make it, and even though he himself could even believe this claim was made), and should not have been persecuted from the very beginning. The authorities should have not started persecuting him at all, because what he did is not punishable under INA.