Technically, this would not be you paying Chipotle in bitcoin.
This would be (If i understand the process correctly, ... though I might be wrong), from your Flexa-enabled, KYC'd, custodial wallet app you then "pay" in bitcoin. Your custodial wallet app then converts your bitcoin to some shitcoin (AMP), then that shitcoin is sent to Flexa, who then pays Chipotle in fiat for your order.