You are referring to this kickstarter: https://www.cybershoes.io/
I skimmed thew article fast, but the usecases they present are a bit awkward.
It looks like an anti-roomscale solution. You have to sit. Also they don't make the case for anything roomscale. You have to sit.
I do believe in solutions for the hands, like captoglove, because the use of fingers in games is far more complicated and is very useful for interaction in my idea. For feet I dunno. It feels different. Feedback for feet might be ok if you wear socks on a smooth surface. In roomscale, maybe ankle sensors are good enough. Just a feeling though. I might be missing out on something good here.