No one thought Biden was ahead by 17 in Wisconsin, the people who did that poll should second guess their methodology.The popular vote falls far short of national polling numbers and the state by state polls were even further off (one poll had Trump trailing in Wisconsin by 17! - he lost by 1). And the polls were only ever wrong in one direction - in favour of Biden.
Even Democrats, in victory, are scratching their heads about how the polls could have been so wrong.
The numbers might have been a bit off, there still counting thou, but they got the results right.