So this product, perhaps in combination with Motip's DPF cleaner spray (without disassembly), probably saved me from a professional DPF cleaning just with disassembly. After I bought the car, the need to regenerate the filter kept lighting up (in case anyone didn't know, the best way to do it is to drive on the highway, and after meeting the condition of a fully warmed up engine, drive for 15-20 minutes at least 2k rpm, but better 2.5-3k). As this was my first car with DPF, I kept putting it off (I had just been commuting about 3km a day for about a week, and thought it could wait) until one fine day the car fell into the emergency bay. Someone wrote here that once that happens, this product won't help. But it seems to have helped me. Or as I say, in combination. I used both products, then "ran" the car as I wrote above. It's connected to the VCDS. I checked the readings (DPF sensor differential pressure, soot value), and to my great surprise they were within normal limits. So, the service menu said to replace the DPF sensor with a new one, and replace the differential pressure sensor. The error cleared, and it hasn't popped up again. That's great for me. I will try to use it regularly, once every 3 months as recommended. Still, maybe it's just me, but I believe about a month after using it there was less consumption.
P. S. It's possible that again, as someone posted here, after the car has fallen into the emergency bay, this won't help. I don't know how the kill switch works on weaker engines, I suppose with a 1.6TDi like this it will be almost impossible to run, so the process of crawling through the car will be almost impossible. I had a 3.0Tdi, and there the power was limited to some 52kw, I think. So it worked, because it basically became a Fabia )