Also wrong. You can always destroy value by making a mistake. Trading and then realizing you made a mistake, just like investing labour and then realizing you made a mistake, does not create value. Trading is not special in this regard.
Value can be created either way: through labour or trade.
Regardless, your statement that all wealth is created by trade is false.
The value from value doesn't come by default; it's not a given.
Neither of those things create value unless they are actually used.
Fixing a tractor you neither use nor trade does not create value.
Growing potatoes you will never eat does not create value.
So, sure, labour can create value, but it's not a guarantee. Trade, OTOH, always creates value.