Devaluing a currency means it's value is lower by a certain amount. That amount is the inverse of it's price in other currencies.
So, by altering the price from 4.3 to 6.3, the value went down. But not by 46%. It went down by 32%. The article also refers to gold's value in terms of this currency as going up 46%. While this is loosely correct, most people round up when the fraction is larger than .5 so this means it was 47% up.
This is similar to discounting something by 10% and then raising the price 10%. It does not equal back to the original.
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