“Against the consensus of the [2022] polls” are Kuo’s words. Kuo might or might not be wrong to impugn the 2022 midterm polls.
Rosenberg himself, FWIW, did not see his prediction as opposing the consensus of the midterm polls – he saw it as opposing media coverage of the midterm polls (from Vox.com, 11/27/2022):
In the months leading up to the [2022] midterms, many pundits and politicians thought that Republicans had momentum enough for big gains at the state and federal levels, enough to count as a “red wave.” But veteran Democratic strategist Simon Rosenberg is one of a few voices in Washington who, despite President Joe Biden’s sagging approval ratings and polls that showed Democrats playing defense on inflation, remained optimistic about the party’s prospects and who was ultimately vindicated by a strong performance.
Rosenberg — who has previously advised the Democratic Congressional Campaign Committee and is the president of the progressive think tank NDN — says he’s not in the business of predictions. But he thought that the available data consistently pointed to a competitive election, and he became a self-described “info warrior” on Twitter trying to convince the pundit class of that. He believes that, unlike in 2016 and 2020 when polling failed to register Trump’s strength as a candidate, this time around, it was the media analyzing the polls who got it wrong.
“There was a massive media failure this cycle,” he said. “The failure that just took place is more grave than the polling error [in 2020] because there were a lot of really smart people who basically misled tens of millions of people through their political commentary in the final few weeks.”