You need to at least put a link to some article that says someone built it, and other pianists agree it can replace both the ACTION and the SOUND of a piano. Oh, it should weigh about 100lb, not 500lb.

(And if such a thing exists, why wouldn't it commercially be available so that everyone can buy it? Plenty of people include me would want it. Why wouldn't Yamaha or Roland build this 20 years ago, as if they don't have the resources for that?)

Also, looks like your comment only focuses on the sound part of it -- if real at all -- and ignores the mechanical part of it. That's a big no.

Before seeing more evidence, I'll just assume such a thing does not exist.