Generally 'discovery' relates to experimental results and not theory. For example, it seems like it would be more appropriate to say that the quantized nature

Generally 'discovery' relates to experimental results and not theory. For example, it seems like it would be more appropriate to say that the quantized nature of light was discovered in the early 20th century when confirmed by experiment and not that it was discovered in antiquity when Epicurus or Lucretius were talking about how light was made up of the smallest possible parts moving very quickly. Also, given the parameters of the experiment in question, it arguably would be better described as "multi-layered Bell" than "Wigner's friend." Everett's also fares well for the Frauchiger-Renner paradox too.