It's not possible to play on "normal" multiplayer servers with this mod, is it?
That's correct.
Is it possible to play any multiplayer at all?
It is, but everyone else you are playing against must also be using the mod. This includes both the server and the clients.
Mind you, the mod was designed so that it can easily be disabled in order to play against people who do not have it yet. But then you lose many of the new features and benefits.
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