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CC2564C: Verifying supported Bluetooth version

Part Number: CC2564C

I'm looking to verify that my system can be certified for BT 5.1. I'm using the CC2564C controller with the CC2564CSTBTBLESW Bluetopia stack. I see that the stack supports Bluetooth 5.1 and is fully qualified. My question is more regarding the controller. The datasheet for the controller mentions "Bluetooth 5.1 Declaration ID D049226" under features. I found this in one of the application briefs though:

I checked the controller and I do see "4.2" returned as the supported HCI version when I call HCI_Version_Supported.

Which version am I able to certify to - 4.2 or 5.1?