At least from what I understand, there are really two factors that deem something hearsay...
- The statement being presented as evidence was made out of court.
- The testimony in court is not being made by the person that made the out-of-court statement.
(For evidence of this, see
this page section c.)
That's why hearsay isn't strictly limited to a witness's oral testimony, because an audio recording, written transcript, or video recording also matches the two aforementioned rules. Although, things get a bit confusing, because there are exceptions to things being deemed hearsay (such as the opposing party rule) and there are also exceptions that allow hearsay to be admissible in court. If it is classified under the prior, then even though it meets #1 and #2, it isn't considered hearsay.
Now, I think what's going on is that we've sort of befuddled ourselves by mixing the commonplace definition of hearsay with the (United State's Federal) legal definition. What you describe is how I assume most people describe hearsay, and it matches what you get
in the dictionary. Honestly, if I didn't see that Legal Eagle video a few months back, I'd be right with you!