I remember when SACD was first released , professional reviewers claimed that the airiness of the SACD sound is nearly ( but not quite) on par with LPs , and thus setting it apart from CDs. I bought an Sony SCD 777 ES in year 2000 and did experienced that added airiness. The advance of SACD did trigger a revolution in the speaker industry, suddenly every vendor had to add tweeters capable of 20khz to 100 khz extension. We then had the tweeters of aluminium ribbon , diamond , beryl,..., and it took quite a while and extensive tweaks for speaker designers to integrate these new tweeters into the existing speaker unit arrays to accomplish flatter FR an phase harmony etc.
With a bit of hindsight, such airiness may still not be the natural airiness of LPs , which is the real thing ( together with mechanical noise inherent with LPs , of course ) . Part of the SACD airiness may well comes from the HF noise ! In fact many SACD players actually trunked the over 50 khz FR , may be to avoid excessive noise .Just like the case of tube base NOS DACs , the added airiness might not be real . It might just originate from the added distortions of tube .
Now with the high number of tap length of Hugo, CD sound reproduction might to a large extent reproduce the airiness in LPs, and to a large extent it might have approached the real thing ,instead of HF digital noise or even degree harmonic distortion from NOS tube DAC. I Believe this may be the real breakthrough that Hugo is presenting to us.
Just my 0.02 cents only . The matter is too complicated for an non audio engineer like me to fully comprehend .