Artificial reverberation has been used for a long time - since the 1950s - in the production of classical music! For various reasons: room with too dull acoustics, strings of an orchestra not very homogeneous and sounding too raw, etc.
And there are different ways to do it: in the past, we used speakers with springs stretched in front of the speaker... we recorded what came out and injected it at the right dose to improve things, more recently we broadcast the sound with speakers placed in a large empty volume, silent and very very reverberant and we recorded to inject this signal into the original recording at the desired dose...
sometimes that works out well...
I'm glad to learn that recording engineers of classical music aren't too dogmatic about real vs artificial room sound, it's all about reaching a convincing and better-sounding result, and if that means adding artificial reverb instead of a not-so-good-sounding real room sound, I'm all in for that.
But, I'm not sure all the audiophiles that this product is aimed for see it the same way. Many of them probably like to think that most classical audio productions are "pure" representations of the real performance in a fantastic-sounding venue.