Yeah, you probably shouldn’t put too much stock in anything that makes claims about the IQs of various public figures. Most are nothing more that hearsay at best (outright fabrications at worst).
Being into chess I see this quite a bit (for some reason many chess players are desperate to equate their hobby with superior intellect). Bobby Fischer, for example, is often stated to have had an IQ of 187. But the source of this is Frank Brady (author of two Fischer biographies), who, basically, heard it from a guy, who heard it from someone who supposedly had a contact that worked at Erasmus Hall (where Fischer attended high school). However there’s no actual record from that school (or anywhere) of Bobby Fischer ever taking an IQ test.
Garry Kasparov is another example. His IQ is often cited at like 190. But….the source of that number is Kasparov himself (who’s no stranger to self-aggrandizement). Some years back he agreed to undergo an IQ test for a German publication and actually tested at like 130. Respectable, sure, but far short of super genius.