What everyone seemed to miss and still misses in the analysis of this question is the fact that the pope must first believe that the decision he publishes in a canonization is infallible. In past times this point was assumed. However, in our current era, as I argue above, it can be assumed no longer.
Case in point, Bishop Bernard Fellay, Superior General of the Society of St. Pius X, gave a conference on relations with Rome on August 16, 2016. At 11 minutes 24 seconds into the video below, he states the following:
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