Can already deliver some good news :-). So, certification catalog in certification manager seems correct.

Reply from VMware:

Kindly note that we will be accepting VCIX-DCV 2020 as a prerequisite towards VCDX-DCV 2021. You can go ahead and submit the VCDX application.

We will accept a couple of versions back of the VCIX for your VCDX submission, so your VCIX 2020 is all good, even if submitting the application in 2022.