First you have to define "Cleaner".
1. Is it an audio measurement?
2. Is the poster trying to describe"usability" as you suggest?
3. Or has one been literally cleaned from dirt?
In all cases, I think the claim is false.
Using my PC with the RME ADI-2 DAC FS offers me much more usability than a Wiim ultra. It offers better measurements, higher quality, superior Loudness controls and a vast number of audio features not available on the Wiim. I much prefer a 13" screen to a tiny screen and I don't have to deal with RCA jacks that are too tight to get cables on/off. In addition, I am reading reports the Wiim may not always hold the same volume setting between on/off periods which could lead to tweeter damage and very loud moments in your life. Not a pre-amp feature I'm looking for.
If the buyer likes it I'm happy for him. But it's certainly not for everyone or "Cleaner".