It is hard to prove the games are fixed
My conclusions are based on the preponderance of the evidence. It is not like the Soviets had never done something like that before.
Consider this recollection:
However, Botvinnik did later state that after the tournament's Hague
segment had ended and the Moscow segment was about to begin, he was summoned to the Kremlin where no less a political figure than Andrei Zhdanov (in the presence of other major figures like Voroshilov and Suslov) told him "We are afraid that the American Reshevsky will become world champion. How would you view it if the other Soviet players were to lose to you deliberately?" Botvinnik claims that he originally rejected this offer outright, regarding it as an insult because he had already proven himself superior to Smyslov and Keres, but that when Zhdanov began insisting, he offered a compromise: "Very well--let's leave the question open--perhaps this won't be needed." Zhdanov happily agreed, and added emphatically "We wish *you* victory."
When will you actually start studying chess games, instead of questioning the strength of the Soviet shess school?
I do. I have been playing through the Keres-Botvinnik games from 1948. Not an honest one of the five.