Certainly a very lucky escape, most landowners have insurance to cover for accidents on their land by third parties. Here is it part of farm insurance.
However the rider's 'stressing just how motorcycles can be dangerous' is a bit of an over reaction to how the incident was caused. The wire could have been walked into at night or a by a farm quad, land buggy or any open topped vehicle.
Just absolute stupidity that such a wire was strung between two gate posts like that, a definite trap.
Here barbed wire is very little used if atall on farms, I've got none on mine, everyone uses electric fences, that can give a nice zap.
I have a small moto-x track in one of my paddocks at the moment used by my sons but come winter it will be rolled up and left to recover.
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Ride on !