Last time I checked, "innocent until proven guilty" was still a foundational principle of Western law. Certain factions may be working hard to chip away that foundation with the intent of enforcing an ideological homogeny, but it's not gone yet.
And as far as i understand this law doesn’t change that. The state would still have to charge you and prove beyond a reasonable doubt that you did indeed possess hate material. Just like how it would have to prove you possessed a stolen gun or whatever. Which is exactly my point - the phase “automatically assumed to be guilty” is phrased to make it seem like the law throws out innocent until proven guilty, which i don’t think it does.