Please contact AWS Support if you want to change back to the standard-instances tier.
Thanks, hopefully this request doesn't require a formal support contract.
Case ID 5896814371
This ended up needing support to do something on the backend to revert back to "Standard" Systems Manager for the Account. The cli input that I tried was stuck in a pending state for days until the support group made their change. They refunded the incurred charges, but hopefully this helps someone else avoid.
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