VHS stores the video as it was broadcast.
But how the audio is stored, has nothing to do with that.
https://en.wikipedia.org/wiki/Analog_television
There were different ways to transmit audio over the air waves, but it was done on a different frequency from the video. There were even schemes to broadcast the audio on regular FM stereo as. Some VCRs had a separate audio in so you could use a separate audio source for instance for dubbing. (But you had to record video at the same time, because of the head switching. So no going back and edit only the audio or only the video, with VHS.)
The audio on VHS was originally stored just like on audio cassette tapes, quoth the VHS wikipedia:
"audio was recorded as baseband in a single linear track, at the upper edge of the tape, similar to how an audio compact cassette operates."
HiFi quote from the same article:
"Hi-Fi audio is thus dependent on a much more exact alignment of the head switching point than is required for non-HiFi VHS machines. Misalignments may lead to imperfect joining of the signal, resulting in low-pitched buzzing"
The audio is not stored at the end or beginning of anything, it's continuous.
https://www.youtube.com/watch?v=IF_rTTptah0
The HiFi audio is recorded "deeper" in the tape, then they video is laid down on top of that.
