Strong Eagle
I don't read Beazelbub's posting like you do.
The point I get is that they will do all they can to satisfy the passenger, but if they cannot, they will offload and then let the groundstaff or customer service staff to resolve the matter.
Also, I don't get why you would question the airline's service commitment, if it delivered the economy seat you bought by moving the large sized person elsewhere (as in a bigger seat.)