Update.
It does not work, the pedal is still squeeking.
To be honest, I used drill at high speed and only a very very thin sand paper, the pin now looks like a mirror but the annoying noise is still there..
Next step: remove the pin again, clean it again with ultrasonic in aceton bath, drill and polish paste, re-was, grease and re-test.
I hope I will solve, otherwise I will remove the pedal center pin with a grinder, build a new pin using the lathe, then I don't know, if necessary I will rebuild also a teflon bushing or I will use a couple of roller bearings.
I'm afraid about removing the two sensors (I don't know how to mount them again in the same old position), otherwise I would put the whole assembly inside a tray full of oil, leaving it overnight.
I'm very upset about the poor quality of this car.