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Did they? I still see a lot of references to the MAX 8 on their fleet page, notably separate from their 737-800 fleet.

Maybe it's not apparent on their websites yet. But expect to see all mention of MAX replaced with -8

Reference:

What's interesting is that in the Portuguese page it's just "Boeing 737 MAX": https://www.voegol.com.br/pt/a-gol/nossa-frota