Borbarad
Advocatus Diaboli
Originally posted by Nephthys
Considering he directly references sources quite as few times I doubt he's just making things up.
Technically spoken, he mostly quotes Sidious on Sidious own knowledge. That while our favorite Dark Lord obviously makes some probably false assumptions, as least when the knowledge Sadow is concerned, because:
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[*] Sadow left the holocron behind when escaping to Yavin 4, given that the thing was later found by Nadd and led him to the planet.
[*] Given that Sadow did continue his experiments on Yavin 4, it's virtually impossible for all of his knowledge to be stored within the holocron.
[*] Combining those facts, it's also completely impossible for Sidious, to accurately judge the extend of Sadow's knowledge, when said holocron is the only source for that knowledge. How should he know, whether Sadow shared 10, 50 or 100 percent of his knowledge, when he can just access a single source? Validation of that idea would be impossible.
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That aside: If that holocron was passed down from Sith Lord to Sith Lord over a time span of several millenia, how could Sidious even hope mastering anything contained within?