Presumably, most of the marchers where the Norwegian woman was photographed were locals. But I've read no crowd sampling data.

When I taught a one week entrepreneurship course at the Univ. of Economics, Katowice I encountered no willful amnesia about Polish collaboration in the extermination of its Jews (Jedwabne, Kielce in July 1946). But I did encounter avoidance and evasion of the accumulated evidence of this in Jan Gross' book Fear: Anti-semitism in Poland After Auschwitz (https://en.wikipedia.org/wiki/Fear:_Anti-Semitism_in_Poland_after_Auschwitz)

The Poles I met in Warsaw at the Wolves Summit startup event in 2018 and 2019 who were willing to talk about this history after hours were exceptional and very out of the ordinary people.