Isn't this about stopping games from being launched like this:

1. Launch Steam
2. Launch game, but instead...
3. It launches a launcher for the game.
4. That launcher launches the game

Going Launcher => Launcher => game.

That should be banned.

It sounds like what you're interpreting it as is "Games that have their own or alternate launchers should be banned from sale on Steam" (e.g., games available on Epic, EA, etc. shouldn't be available on Steam).

I'd agree that that's anti-consumer. But if I buy the game on Steam, it shouldn't feed me through an additional launcher. If I want to buy the game directly from elsewhere and that requires a different launcher, that's perfectly fine.