alt Hacker NewsIt can't be written down as code, that's the point.
I am more familiar with taste in coding and it can at best be described—that the resulting code is too subtly different from something else in the codebase, that you're masking a different bug, that you're not following what the code tells you. The good part is that while this cannot be unit tested, you can write documentation and code comments about it that tell people what they need to know.
But for taste of the kind described in the article there's not even a definition. The logic ended up being "trust a bunch of opaque weights the most"
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Technically, AI is code, just very complex code.
I'd say there are "simple" simple things you can do though, like take automated screenshots and detect colours for jarring colourschemes.
Apple's human interface guidelines says that some things can be written down though. It's a very thurough look at UX and while they don't adhere to them perfectly themselves, it's very much a north star to a some ideals. You can't unit test for taste, but you can integration test that bad tastes haven't happened.