It's important to know the context. That poll was made the very same days the Brazilian Federal Police performed search warrants against Bolsonaro and his allies. Which was a key step in finding incriminatory evidence now publicly presented and accepted during the current judgment. IMO it's no wonder 47% of respondants said so in that moment. You can also check that this was the opinion of ~82% among those who voted for Bolsonaro at the presidential election 16 months before (49% of votes). And in another question of the same poll, 99% of his voters believe ex-president Bolsonaro was being unjustly persecuted (average was 42%).