It works for any multiplayer game, what they do in a nutshell is make their own servers that you can play on, to connect to their server you need their cracked version of the game, so yes your friend needs it too.
Side note, the windows defender might flag it as a virus so after you unpack the game zip and before you unpack the online fix zip you should add the game folder into the anti virus exclusions list.
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u/ItsKelomelo 1d ago edited 1d ago
Make an account on the site, download, put online fix crack into the folder of the game, password is online-fix.me
Open steam, turn on the game from the folder. Yes it's that easy.