If there is an issue with the underlying polling technique, making the sample larger does not guarantee more correctness. You simply end up with a larger set of bad data.
2. This sample in the Telegram poll is ~20% the number of voters in Belarus.
The poll itself says 59% of the 2.3m respondents were people who voted in the election.
That's 1.4m people, which is 15% of their population and 21% of their eligible voting population.
But that’s not what I was taking issue with. Above, I was disputing the claim that a large sample size “guarantees correctness”
Likely, neither this Telegram poll nor the election are statistically sound in their results, for different reasons.
I am not saying that the Telegram poll has to be statistically sound to be valuable evidence.
People are not complaining because the election is a biased sample of the population (not possible because by definition an election is open to all eligible voters).
People are complaining because they believe the government is not truthfully reporting the actual election results.
Good polling technique cannot mitigate fraud.