Sorry, misunderstood....
I really didn't bother looking at the video....should have....as, that was the point of the posting. Sorry....
However, when landing in a crosswind, you're doing a side slip. When taking off, experiencing an engine failure, you're doing a side slip.
The rudder is stressed for this.
However, as PappyJ mentioned, though, it is not stressed for some movements, even below the 'maneuvering' speed. Please refer to Airbus
FCOM Bulletin Number 828/1 dated June of 2004.
This is what got American Airlines...the Airbus A-300 coming out of JFK....
For whatever reason (poor training, ignorance, etc.), the flying pilot made extreme movements of the rudder back and forth....one way, then the other way....and this is what broke the tail off. This is what overstressed the tail. This is what FCOM Bulletin 828/1 addresses.
But, to be clear, side slips are routine maneuvers....(as in crosswinds)...
and, not-so-routine in engine failures. The rudder is designed for this....is stressed for this. When the B-767 did side slips (video), I sure the captain was not banging the rudder from one limit to the other. This is not how you do a side slip....or a forward slip.
Fly safe,
PantLoad