It's easy to compare listening to this
Play first the official SFA video and then listen to the first minutes of this VHS sourced video (forget digital 'restoration' and FPS upscale, this is never true when source it's limited, but here audio is in true mono, it is one of the lots of VHS copies recorded on supposed mono broadcast).
Then compare with (Pre-)FM sourced bootlegs. For example, this copy with audio sourced from FM bootleg:
I can't distinguish If official SFA video is mono or very discrete stereo, but I can distinguish perfectly mono sourced VHS copies and (Pre-) FM bootlegs used to replace mono audio from this old homemade VHS captures.