Hello Rrrila,
I came to this forum seeking solution for the same issue. Found nothing yet, unfortunately. As far as I know, the Whisper library does not have a built-in option to disable timestamps for the transcripts. Well… you can always try manually removing the timestamps from the output file after running the command you mentioned. You can do this by opening the VTT file in a text editor and deleting the lines that contain the timestamp information.
Also, it would more reasonable to reachout to the developers of the Hugging Face library or the Whisper library directly seeking the solution (waiting for their response rn)
If I’ll be lucky enough to find the solution, I’ll make sure to post here