I'm not saying that I agree with Apple on this, but my tuppence worth is...
If the issue being reported is effecting XR, XS and XS max phones, these have been on the market less than a year. If i had a phone (of any make) that was less than a year old that needed the battery replacing, i would be straight the manufacturer / retailer and politely 'requesting' a new one, as there is obviously something wrong with it.
(also, I'm not saying this doesn't happen on older phones, only that the article is referring specifically to new phones)