UPD2: It still spams log. Not so much, but id didn't disabled service logging.
So, How to stop it?

UPD: Full machine restart helped. (I restarted Fusion service, didn't understood correctly what I need to restart).

As said in /advancedsettings/#general_disableloggingfordisplayfusionservicerequiresmanualchangeusingregeditandreboot there must be REG_SZ parameter "DisplayFusionServiceDisableLogging" in "HKLM\Software\Binary Fortress Software\DisplayFusion" with value 1 to disable logging. (with service restart, of course)
It didn't works. With HKLM or HKCU paths - service spams log 2-15 times in a second, nonbuffered, with a short strings from 128 to 240-250 symbols, each of this rewrite is using 4k block of SSD rewrites. For months. Just seen this now.