No. It just shows K/D and in no way can tell you how many people fly it. A few skilled players could pick one under used plane, get a few thousand kills in it, and by what you're saying it would show that more people are flying it when that wouldn't be the case.
It's not showing K/D, I add kills AND deaths.
Plane A, the "n00b" plane - many users at mediocre skill level: 500 kills, 500 deaths = K+D 1000
Plane B, the "experts" plane - few users with superior success: 500 kills, 100 deaths = K+D 600
Granted, it's still not showing number of sorties, which isn't unlikely for plane B to be even lower, but again you get a general "feel".