It is true that conspiracy theories have been found to have significant amounts of evidence and scholarly language. However, this does not make them true or trustworthy.
For instance, Joseph McCartney released a book during the Red Scare that had 314 footnotes.
This made the work seem more reputable. However, the footnotes did not actually back him up - they were simply there to give the appearance of evidence.
This is common among conspiracy manifestos. Evidence quality will be very low, consisting mostly of factoids, while conflicting evidence is dismissed completely.
It is also easy for conspiracy writers to simply appear reputable by continuously referencing each other.
Additionally, even if evidence is legitimate, it will often lead to extremely tenuous conclusions.
While the way conspiracy theories are written may make them seem legitimate, this is by design, rather than because they are actually true.