Why would you lie about Müller like this? At least 2 articles here in Dec showed him supporting the Pope rather than the 4 dissenting cardinals. He even restated the teaching in AL in words that should have been more palatable to the Pope's opponents if they were more objective about the issue. 

Since the cardinals made their dubia public in Nov, it is hard to see how Müller's support of the Pope throughout Dec could be portrayed as "persistently" coming out in favor of them.