I mentioned this subject in one of my last articles for PM, coincidentally. Great technique topic. Having the bar in contact with the shins prior to pulling it from the floor allows the lifter to feel the correct position of keeping the bar as close to the body as possible. It's true that dragging the bar up the shins is poor technique. But it's possible to have the bar in contact with the shins prior to the pull without dragging it as the pull commences. This is how most/all of the best lifters in the world do it. This video has a good demonstration of what I'm talking about.
This is the World Championship from 2006, 85 kilo C&J. It's a long video, but just look at the first two lifts. One is a C&J by Martirosyan and the second one is from Calancea. The camera angle is perfect to show what we're addressing. They have the bar up against their shins prior to the pull, but they don't drag it up the shins in a way that harms their technique. Martirosyan's lift especially because the camera actually shows the bar nudge his sock as he pulls from the floor. If you watch their snatches, you'll see the same thing. On some of the lifts, the camera is too far away to see a close-up of the bar or shins prior to the pull. But it's obvious that they are in contact. If there's any separation, it's no greater than the length of the hairs on their legs. There's a slow-mo shot of Rybakou's lift at 16:15 of the video that also gives a perfect shot. There's just a slight difference between how these lifts look and how Alex's lift looks. Very tiny difference, definitely. Overall, he's doing a lot of things right technically.
Not dragging the bar up the shins is something it took me years to master. I definitely had my share of bloody shins in my early career. But it came around eventually.