We had a different but similar one hooked up to a dynamo on one of our work bikes, if you're looking for it you notice it but I can't see it being much more than a gimmick when most bike lights do some sort of combination of flash/pulse thing most of the time anyway.
https://www.voilaz.com/products/zlite-cycling-bike-rear-light?variant=16309798895689
Light question, is this kinetic brake light thing useful? anyone has this light? comments? THX