Little update: dived into reading the Steam Cloud API... Thought it might be related to IsCloudEnabledForApp VS IsCloudEnabledForAccount . Performed a test: disabled Steam Cloud at a game level first, and then disabled Steam Cloud global setting as well. Didn't help, that player-data json file gets ...

Ok, this is weird. It appears that player-data.json never gets a full reset. Probably, it synchronizes from somewhere (Steam?).

I have a game version in Steam, without DLC, just the base game.

Inside the steam settings I've turned off "Steam Cloud" for Factorio, so it won't "keep game's saves ...

Any workaround?

I have the same problem. I just want to fresh start. I can delete saves, can reset all other settings, but resetting tips is not working.
For some reason there's no such a button in the settings menu in the first place. But hey, ok, there is a console command /reset-tips. It cleared ...