Quietness has many aspects. You have engine plant noise, other machinery noise, waterflow noise, cavitation noise .. all of these vary with speed.
Kilo for example is quiet at low speed and at stop. Otherwise it is not very quiet (in DW, supposed to be the same IRL). There is some room for improvement.
Also quietness is not the most important thing. The most important thing is ratio between detection and counterdetection range. Kilo is hard to detect, but it has rather weak sensors (especially it does not have TA). So most of the time Kilo is detected first, even if it has noise advantage.
Why they sell Ladas I can't really tell .. why people sell weapons at all ?
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