FYI, the concept of galvanic isolation and the digital lens are two different things addressing two different digital performance improvement goals. The former looks to tame noise. The latter looks to tame jitter.
From the PS Audio description of their new SACD transport:
“New to this model—and for that matter, any disc player ever made—is our galvanically isolated output stage. By coupling the output of the drive mechanism to the PST’s internal Digital Lens by nothing more than a pulse of energy across space, any hints of noise or ground contamination are eliminated.”
The “air gap” referred to here is intended to drop any noise that is being carried along with the ones and zeros, allowing just the bits to head out to the DAC.
And here is a description of the Digital Lens “technology” from Paul McGowan back in 2015:
“The Digital Lens is a regenerator for digital audio. LIke the venerable Power Plant AC regenerator, a Lens recognizes incoming data, throws away the original, rebuilds new and jitter free digital audio before the DAC gets it…If timing (jitter) were to blame for variations in sound quality, I had imagined we could prove that by removing the suspected clock/data relationship. We know jitter does not occur in stored data without reference to a clock. It is only when that data and clock are paired we risk jitter…Thus, the audio RAM buffer was ‘invented’ to solve sonic differences.”
[Source: The Digital Lens – PS Audio]
Apparently, improvements have been made to the application of the Digital Lens/data stream buffer and the amount of bits stored and “regenerated” in the current iteration deployed in the PST transport is much less than in previous iterations.