How do I use this...

Copy this card into your own deck then have fun!
And probably turn on the toolbars (Decker > Toolbars) so you can easily see and use the new brushes you create! (This option will not be available in the itch.io embed, sorry)

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Are these like Decker's 1-bit logical patterns?

Nope! You can use any color in your palette with these patterned brushes. (On the other hand, they don't use any of the features that you get with logical patterns like easy flood fill. If you'd like to edit the logical patterns instead check out the second  contraption in this post)

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What do you mean temporary brushes?

These brushes will only exist for the current session of your current deck! Maybe you need big brushes during one session, and tiny brushes the next. Just make what you need at the time and know they'll all be cleaned up later. It's all experimental for now!
Aside from any brushes you make, there's also the "test" brush which live updates with your selections on the ditherlab card.

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But what if I want to keep my favorite brushes forever? 🥺

You can make a brush module of your favorites and bring them with you into all your future projects. Check out the Decker documentation or the community forums if you need help with that.