Joe Alwyn received Grammy-era recognition as a co-producer of Taylor Swift’s “august.”
Swift and Jack Antonoff are credited as the song’s producers in the Folklore liner notes, while Joe Alwyn was later recognized by the Recording Academy as a co-producer after Folklore won Album of the Year at the 63rd Annual Grammy Awards.
Alwyn used the pseudonym William Bowery for songwriting and production contributions to Swift’s 2020 albums. That credit history can create confusion, because his name is not always the name listeners see in the original album materials.
This question concerns production, not songwriting. The listed songwriters for “august” are Swift and Antonoff, while Alwyn’s relevant contribution is his recognized co-production role.