I don’t think this is correct. When/if City are cleared his audience will become stronger.
If you tell a conspiracy theorist they are wrong they just become more entrenched in their beliefs.
ie, if City are cleared it won’t be because they are innocent, it will be because there has been a cover up, expensive lawyers etc etc.
A not guilty probably helps Harris and his ilk because these people are their core (albeit dwindling) audience.
Any notion that even a total exoneration will see the world suddenly accept City have done no wrong is fanciful in the extreme.