Going back tosking what the Mandela Effect means, I reckon:
Genuine "Mandela Effect": Formula 1 began in 1950
Pedantry: The Formula 1 World Championship began in 1950
"Genuine" Mandela Effect would be something like: "I remember the F1 world championship starting in 1937, but I can't find any reference to confirm that."
The Mandela Effect has to be something that is clearly wrong, but with the slightest nugget of fact to cause the false memory. So for example in my example above, there was Grand Prix racing and even a championship in 1937, and that would be enough to create the false memory.
"Formula 1 began in 1950" is simply an oversimplification resulting in an incorrect statement. It wouldn't be attributed to a false memory, simply an extrapolation of the current championship and its identity that misses some details.
"The Formula 1 World Championship began in 1950" is better, but still incorrect, for the same reasons.
Wasn't it the World Driver's Championship that started in 1950?
That would be the correct one.