Watching them blindfold you and spin you around before starting reminded me of similar drills that I trained as a child. But they involved donkey tails and piñatas and always ended with candy.
IMO blindfolded training involving various forms of
contact training such as clinch-work, grappling, and blindfolded chi-sau are very useful.
I'm not so sure about stalking opponents in a darkened room, but then I've developed a hearing loss over the years and since having COVID, I don't smell my training partners as strongly as I used too ...and frankly, that's a blessing!