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It's a moot point anyway - the could not change the UI beyond converting physical dials to virtual ones, because that would have required retraining which they wanted to avoid.

Even if they could have changed the UI they still needed to hide the existence of the MCAS system, again to avoid retraining, so it's doubtful such a clear an helpful error message would be allowable.

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It isn't a moot point, it is literally the point of the article. The whole article is explaining the history of the 737 and explaining why they designed the max to avoid retraining. It mentions digital UIs, fly-by-wire, and other designs found in modern jets to paint the picture that the Max was successful in avoiding retraining, but that requirement restricted the engineers and led to a potentially compromised design.

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