Total nonsense. This only applies to the state. Individuals are totally free to believe that a person not convicted of a crime or even proclaimed innocent by the state, is in fact not innocent.
If your legalistic fiction of innocence was correct, then individuals would have to believe that the law is the infallible representation of morality, which is an abhorrent claim. What I meant by the quotes around innocent is that the state has not yet deemed them criminal, but I disagree with the state on that assessment.