How would you describe "the feeling of having had a victory that wasn't actually deserved, but you fully believe was deserved"? I have a hard time seeing how this feeling would be different from "the feeling of a deserved victory"? As such, I have been using the latter, shorter form to describe the feeling involved.
The difference is that a simple fact would break the spell.
I mean, consider: "The feeling of having a friend that actually would backstab you if it would be helpful to them, but you fully believe would have your back through thick and thin". Would you not say that that feeling is false, even though the lived experience of that person (until they learn the truth) is one of great friendship. (I use this example because I've, unfortunately, had it happen twice in my life. Only two times ever is a pretty good rate I'd say.)
Or consider: "The feeling of having saved someone from danger when you didn't, but you fully believe you did". Would you not say that this feeling is also false, in this case, a form of false valor? I like this example a little bit better than the previous because there could be many cases where nobody can
prove either way that the feeling-haver did or didn't save the deceiver. And the deceiver might even be doing it for a noble reason, like trying to give a self-confidence boost or whatever. But ultimately, that valor really is false, and the feeling produced by that lie really is different from a feeling that is both held,
and actually true.
Hence, a player deceived into believing they earned a deserved victory, is not
actually feeling the feeling of winning a deserved victory. They are feeling victorious feelings, yes; and in the absence of more information, they'll have the same response to both stimuli. But the feelings are different because the facts are different. They may personally have the visceral response of triumph in that moment, sure. But just as the blue light of an LED is different from the blue light of a star, even though both may be perfectly tuned to primarily output in the 450 nm range (the latter by accident, of course), the false feeling of victory is different from the true.
The truth always matters. We must be very careful--it is, after all, a terribly sharp sword--but it should always be our aim.
edit: As such, I have not meant to imply where the feeling is actually coming from. The cause of the feeling I have described in detail with language I think you would find sufficiently precise?
I'm not entirely sure. My stance is: there is a difference between a feeling that reflects the factual state of affairs, and a feeling which
does not reflect the factual state of affairs, even if the feeling-haver is certain that their feeling is correct despite it being incorrect.
And on this we agree. (Though I get the impression we are in a minority)
Unfortunately, yes, I do think this. Really wish we weren't though.