comment on the captions decision tree

Hi,

I was recently using your captions decision tree
<https://w3c.github.io/wai-media-intro/accessible-media/decision-tree/> and
wanted to ask a clarification about the language of one of the sections.
Specifically, about the question-and-answer pair as follows:

*Does the media contain only video with synchronized audio?  Yes...and
there is already text on the screen that accurately reflects the audio
(including both speech and non-speech elements). --> An alternative is not
required.*

My question is, what does "text on the screen" refer to in this instance?
Does it refer to any text on the webpage, for example, a transcript, or
does it refer to text specifically within the video (for example, animated
text or hard-coded subtitles)?

Thanks!
Marty Strauss