As Applejuiced pointed out, it's happening to iPhone 7's that have "healthy" batteries by Apple's standards. Some are above 90% health even.
What are you even talking about? None of this has been public information for "a year already."
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The only link AdonisSMU shared was an Apple statement with absolutely no regard to throttling, with the only elaboration on Apple's statement that could even remotely be construed as related to slowdowns coming from a third party. Even then, Apple cannot use an independent organization's publications as a public announcement because they didn't issue it. This information has not been available; Apple kneecapped themselves hard on this one.