What's yaml have to do with anything? It's like python with syntactic whitespace which is unrelated to this discussion. The Tab vs Space debate is entirely around non syntactic whitespace which doesn't effect how the code is parsed. And yes Python technically does both tabs and spaces but it's all sorts of fucky.
Terminal editors while still used a ton aren't really what I was referring to. Newer terminal editors such as Helix have tab width configured per language most of which default to a width of 4 spaces but toml/yaml both default to 2 spaces. I was mainly referring to GUI editors as frankly that's just what most people use nowadays. JetBrains IDEs, Visual Studio, Eclipse, VS Code, Notepad++ were primarily what I was thinking of as I've used all of them and they all default to a tab width of 4 hence why I said nearly universal. Also I said nearly terminal editors being the only editors I've used that don't default to a width of 4 seems like a fair usage of the term.
Looking at code on somebody else's screen is entirely missing the point of using tabs over spaces. The entire point is that mine looks like how I want and theirs looks like how they want even though the file is identical. We can each have wildly different tab width and it'll look wildly different to each of us when we program. That's again the point.
Code formatters are great! I love them. Using tabs over spaces is objectively a better formatting option. One of my favorite features in code formatters is that they'll swap out spaces to tabs for you insane people who insist on mashing the space bar to indent.