That doesn't contradict the EMH at all. The EMH does not say that stocks never go up or down without news.
But that was the biggest rally in a very long time, 3% on broad indices, only to erase all gains and continue lower
Somebody created exit liquidity
Any theory or hypothesis that has zero criteria for being proven wrong is not science and has no place being repeated at all
So you’re not wrong about it not contradicting, because nothing does since its a bullshit saying masquarading as a hypothesis, there’s just no point in leaning on it