A pro surfing vid: forehand "frozen"?

I recently ran into this video by a 14-year old -- it looks awesome but I got a question.
It seems to me her forehand is somewhat frozen and stays mostly static. Huge contrast to backhand. Is this good?
I am aware of the advice of always placing your leading arm outside the rail. I'm more confused by the forehand being somewhat stiff/static, and am wondering if it's a good habit.
It seems to me her forehand is somewhat frozen and stays mostly static. Huge contrast to backhand. Is this good?
I am aware of the advice of always placing your leading arm outside the rail. I'm more confused by the forehand being somewhat stiff/static, and am wondering if it's a good habit.