Apple Music Apple Music Free for 6 Months Offer with AirPods — Old Purchase

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I purchased my 2nd Gen AirPods just after release (March 2019 to be exact) and after updating to iOS 15, I am now being told that “Your AirPods come with 6 free months of Apple Music. Redeem now.” This seems strange to me since I bought my AirPods 2.5 years so ago, and am just now getting this pop-up in Settings.

I have never used Apple Music, either paying or through a previous trial, so maybe it has something to do with getting new users with the iOS 15 update?

Has anyone else encountered this? Thanks.