pete,
that's true but if a named variety is to remain true to its form, the propagation should be done through cuttings/cloning so the characteristic of the tree should remain more or less same as the mother tree.
if the tree has been pollinated and viable seed was taken, that really shouldn't be "Celeste". the resulting tree is a new strain, different in genetic make up from the mother tree.
but it seems as if someone just calls a fig Celeste if it does well in south, very sweet, sort of pyriform to round, small to medium, can be different outside color, can be different pulp color, can be different leaf shape.. i'm not sure about you, but that seems to put in lot of different figs into one same name.