Is there an editor that can do things like this? Or is it all laid out by hand?
[1] https://neil.computer/notes/berkeley-mono-february-update/
Given the file name “Artboard-2” my guess is that it’s done in Adobe Illustrator, but you can do that in any graphics editing tool like Photoshop, Figma, Sketch, etc.
For typographic work, I recommend a vector-based tool because it scales to any resolution.