By that definition, YMMV deals that requires overriding like coupon or discount after pricematching or on clearance price when it shouldn't be allowed are also social engineering.
That doesn't disprove the point at all, lol
Social engineering is the practice of manipulating a person into doing something or providing information (usually confidential information, like passwords, etc). So if, say... You should only get the discount OR the pricematch, but you either try to coerce the cashier into doing both or trick them in some way, yes, that would be social engineering.
Submitting a form saying "Woe is me, for I hath lost my beta key! Please help!" when you never had a beta key to begin with is very much the same, because you are manipulating the person working that form by deliberately misleading them.
Again, I'm not judging - You do you, booboo. But saying it isn't something that it is seems silly. Just own it.