Hello all!
I’m impressed to see such a lively discussion about my landing on the other end of the planet.
Now, let me clarify a few things to those who is interested and for those who thinks I'm an idiot putting everyone in danger.
1. This is a private airfield with a 400m runway.
2. The only people fly there are those who own or rent a plane there, and there are only few light and ultralight a/crafts.
3. The runway is not equipped for IFR or night, so no IFR flights whatsoever.
4. The airspace in the area is class G.
5. There is a traffic information frequency, where everybody who is flying in class G air space should make position reports (including me) from time to time and monitor it constantly.
6. No one but me was flying in the area this time, but me.
7. That day I was just flying around the airfield not higher that 1,000 ft, doing touch and goes, so I was aware of the visibility situation and noticed a change with each approach.
8. There was a very thin patched layer of fog before take off, you could see through it. The visibility was perfect above with clear skies and sunny weather. (I have a full video of it, but it is about 40 minutes long).
9. In my opinion that wasn’t a radiation fog; that was an advection fog, as it was close to the sunset and the fog was moving. The sun is to the rear on my left.
10. When doing T&G, I touched after the threshold, so paved runway was more visible through the fog (and it was not so intense like when landing).
11. The owner of the plane was on the airfield and kept a radio contact with me. He was the one who advised me to land short of runway on the grass and it was suitable for it (just covered with thin layer of snow this time, but it was prepared for use), as the paved part was slippery (just allowing for a safety factor), however if it was up to me, I would make it after threshold and would have enough space to bring it to stop.
The other guy was shooting photos of me coming out of the fog.

I did not see them yet.
12. From above the airfield and runway were perfectly visible, so that told me that the fog layer is rather thin.
13. I was landing with flaps 40, approached shallow on purpose (in order not to overshoot, just in case).
14. I aligned to the center of the runway while it was visible, then dived into the fog (the layer was rather thin) and kept the ground in sight. Yes, I did not see the runway when leveling off (after 0:32 on the video). After passing a string of small bushes (watch just before the touchdown), I knew I was over the grass part of the runway (otherwise it would be difficult to tell) and safe to land. Power to idle – touchdown.
15. As to safety - I was only few seconds in the fog without front visibility, but in sight of the surface. Not enough to get off course, especially with no crosswind. To whoever said I was off the center line: watch the video, I rolled out just on the centerline. When slowed down, I didn’t try to keep it longer moving to the left and continued to taxi to the end of the runway to get off it.
I enjoyed the experience! It was interesting how you can see through the fog from above (not even noticing it’s extent), and how the visibility changes rapidly as you move close to the ground.
To be honest I was surprised, when I got off the plane, and saw what it looked like from the ground.
I think it is better to try flying in various conditions while training (in the known area, around home airfield), rather than bumping into something you would not expect during cross country flight.
I am now in the middle of my ATPL studying.
Cheers!
Vlad.