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It's an evolution of E-Stays in one form or the other.
The design comes and goes in popularity and has been about since the 90's. Nishiki I believe were early experimenters. I can't be arsed to look it up.They had a lot of benefits but a lot of draw backs too. Might be better now with materials advances.
Chak
I think the stays are an alternative to the dropped chainstays like the OPEN UP, clearing big tyres and cranksets without lengthening stays.