This is called an appeal to authority. It is a logical fallacy, usually a sign of a confused or poorly constructed position.
By this argument, only billionaires are allowed to have an opinion on anything tax related. In fact, by having an opinion on Buffet, Von Doobie is engaging in a performative contradiction, as only Buffet (according to EVD) has the intelligence and experience to judge his own experience vis a vis Wickedfire.
I think investing at 11 years old and being an old as fuck billionaire means you have more intelligence/experience than any WF member, unless I missed a big chunk of his bio.