I find it somewhat amusing that they had to find "scientists" to explain this, when the purple tinge is something that LED TV repairmen have been dealing with for around a decade now. However, they're correct that it's because the phosphor layer is getting damaged, probably because they're being driven too hard by the LEDs, which are now being optimised for brightness and recurring revenue instead of longevity and efficiency.
Also, I personally think spirited driving on a purple-lit nearly empty highway at night is a uniquely fun experience with an 80s-retro-futuristic vibe. The streetlights are merely accent lighting at that point; the highbeams are for actual visibility.
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