Advice on "La voix du luthier" soundboards (speakers) ?

Perhaps you don't know the existence of these innovative soundboards :
https://www.la-voix-du-luthier.com/#home

I wonder how their "Onde" and "Pyramid" speakers will sound with a digital piano, or with a Pianoteq or other piano vsts.
Their technology seems very appealing : no speakers but 2 wooden soundboards for stereo (treble in front, bass behind), that provide a large acoustical environment like an acoustic instrument.