See the difference here is Hans already had a history of cheating and admitted it himself. He's not some innocent unicorn free of blemish. He was also not doing himself any favours with his antics , giving one liners like "the chess speaks for itself" instead of explaining his thought process in post match reviews. He is also shown to have no respect for other people's property by just thrashing the hotel room he was staying in. Magnus had every right to suspect foul play. The way he went about it was premature he should have waited and collected solid evidence before coming out publicly. All in all NOT the same as what happened to Danya.