I really doubt a breeder would waste time looking over 100,000 + seeds to sex them.......
If this was a viable solution breeders would be using this method instead of silver reversal to make males for breeding to make female seeds. This "idea" has been around for a long time and is nothing more than a myth much like people who think a seed that floats in water won't germinate, or seeds with stripes will grow more buds blah blah blah...