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As others have mentionned downloading the .deb and running it will also work, but I feel nobody gave your a tldr of why you may want to follow those instructions instead, so here it is:
Those instructions configure your package manager (apt) with a new repository for this application.
The upside to that is that anytime you will look for updates, this app will also get updated.
It’s a bit more work up front, but it can pay off when you have dozens of app updating as part of normal system operations.
Imagine a world where windows updates would also update all your software, that’s what this is.
I think you are right about the lack of diversity.
My own take on it is that lemmy is currently populated by early adopters. There might be a relation between beign open to try new things and being left-leaning, I don’t know.
But I do think that over time, if Lemmy survives it’s early day phase, more people joining should bring more doverse point of views.