Well ...
I gues this is also possible.

Maybe i was just hoping for some less typical story.

I think both solutions are fine, I am very curious to know what really happened 🙂
But even if Wyll did make it all up, I think he truly wants to help others.
I like the fact that we are discussing and speculating about the motivations of a video game character.
Personally, I think that Larian's writers do a very good job, the characters are nuanced and complex enough that we
do have something to think, talk and speculate about 😀