An alternative reality is saying that polling error is uncertain? I didn’t declare anything about it’s direction or even that it couldn’t be the same as it was earlier

This is something plenty of election modeling people say all the time

Over the long term, there is no meaningful partisan statistical bias in polling. All the polls in our data set combine for a weighted average statistical bias of 0.3 points toward Democrats. Individual election cycles can have more significant biases — and, importantly, it usually runs in the same direction for every office — but there is no pattern from year to year

https://fivethirtyeight.com/features/weve-updated-our-pollster-ratings-ahead-of-the-2020-general-election/

The reason there’s no long-running polling bias is because pollsters try to correct for their mistakes. That means there’s always the risk of undercorrecting (which apparently happened this time) or overcorrecting (see the 2017 U.K. general election, where pollsters did all sorts of dodgy things in an effort to not underestimate Conservatives … and wound up underestimating the Labour Party instead)

https://fivethirtyeight.com/features/the-polls-werent-great-but-thats-pretty-normal/