Good question. If I wish nothing and nothing happens, what feelings might come up? In the case I feel disappointed, I can ask myself, what wish I possibly could have, because, if I wouldn't have a wish, no disappointment would have arisen. I even would not have any emotions. Not even happiness.
I still could reflect on the fact of disappointment and may refrain from it after a while of musing. Using my mind as a tool of free will.
I would know in retrospect.
Here is the link you referred to:)
https://hive.blog/art/@erh.germany/let-s-play-cards