According to revisionists, 100% of the witnesses who worked inside an AR camp, Chelmno or A-B Krema, lied. List of over 300 names here;
https://www.skepticforum.com/viewtopic.php?t=32920
Witness evidence is not normally perfect, but revisionists think it is when it comes to their lying. They all maintained, for decades, the perfect lie, so that we still do not know what really happened in those places. Not one of them broke ranks, or accidentally blew the lie. Nazi and Jew, German, Ukrainian, Pole, Hungarian, French, Slovakian, Italian and Greek, despite all their differences, colluded and lied.
How unlikely is that?