Except that the point about the barring proves Vic never was a hen.
The father had no barring. He has two Z sex chromosomes, and neither one of them has barring on it. So he could not give barring to Vic.
The mother had barring. So she has a Z chromosome with barring, and a W chromsome that makes her female.
The mother gave Vic the Z chromosome (with barring, and makes him a male.)
If the mother had given Vic the W chromsome, Vic would be female, but not have any barring.
So it comes down to the very simple matter of which chromosome Vic inherited from his mother. Because Vic shows barring, he must be genetically male (ZZ sex chromosomes), not female (ZW sex chromosomes.)