whys the hint for belied?

Someone please explain why derided is wrong

In a nutshell, the meaning of the sentence is this:

Even though the previous vicarious was not good (laxity or negligence), the new one disproved (belied) who thought the new course would be much positive. Indeed, the ongoing action is pretty much the same the previous. In addition, considering the powerful position of the new bishop.

Hope this helps.

Regards
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Despite having engineered and overseen the return of several stray dioceses that had broken away under his predecessor's negligence, the bishop had a modest and open quality that why not construed? the eminence of his position.
Contrast word Despite shows that there should be a positive connotation in the second sentence. Isn't so?
@carcass please help

Focus on the word "Despite". It says that despite having engineered and overseen the return of several unexpected and things out of place under his predecessor's negligence or laxity, still the bishop had a modest and open quality that belied/failed to justify the emininence of his position.

Exactly.
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Laxity, belied, eminence

kudos