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Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones
(www.youtube.com)
This is a most excellent place for technology news and articles.
Got proof? I've not cracked open a phone for a while to see if the component labelling matches the interface, let alone tested capacity of an extracted battery directly.
https://www.wired.com/story/how-to-improve-battery-life-tips-myths-smartphones/
Article rests on one expert. That assistant professor's publication list doesn't seem to contain evidence about it, plus the quotes in the article don't directly say it happens.
Maybe it does, but that article only seems to be guessing based on (admittedly reasonable) theory.