Morally that husband made a bad thing as he wanted to hide and steal that money from his wife. I don't support it and I feel happy that the wife detected it by herself.
His husband work all the time to make money while she's only become a housewife and live comfortable, how can the husband is stealing his wife money when he's the one who make it? that's an another story if both of them are working regardless how much money both of them make.
a very decent asset to keep secret from other people
You will not give all of your coins to your child? so you let all of your coins gone when you die?
Anyway splitting asset during divorce is already nothing new, usually a man is playing smart for use his mom or father name behalf of his asset, so when divorce happen, all of his expensive asset is safe.