The 'stimulus payments' are 2020 Payments (even the one received in 2021, because it was authorized in late Dec 2020). They just used 2019 numbers because most of the 2020 returns were not received/accepted/approved when they started the stimulus process.
The stimulus payments had NOTHING to do with 2019 filing status...they just had to have somewhere to start getting info. Likewise, the recovery rebate should have NOTHING to do with 2019 filing status.
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