tbh I don't fully understand that instrument yet, but it's the designer himself to make this claim about limitations of his previous creations.
Imho it's not meant in the sense of even/uneven harmonics, but refers to individual, slightly detuned partials in the cent range.
I'm a big Fender P-Bass fan, strung with flatwounds and recorded straight via a quality DI.
So a synthbass often isn't that exiting (for my personal taste), but Infinite allowed to tweak some basses that were plain stunning - in punch, expression and tonal depth.
(usually this app is associated with synth atmospheres lingering in endless spaces...)
It was a big surprise and while still puzzling what exactly caused this 'so natural' impression, it confirms W. Palm's statement (I just modded some presets).
For anyone interested in the Camel Audio synth approach this is a valid alternative.
Requirement is IOS 8, so it will run on older iPads. I use it on an Air-2, but can check on an iPad 2 how much juice it needs.
In any case it's an outstanding synth and the touch design/response is great in all PPG apps.