Is "yum-config-manager --enable rhui-REGION-rhel-server-extras rhui-REGION-rhel-server-optional" necessary?

I’m running certbot on an aws ec2 server with amazon linux 2. I’ve used this documentation: https://certbot.eff.org/lets-encrypt/centosrhel7-nginx.html. I’m wondering about step 3 in the documentation:

yum-config-manager --enable rhui-REGION-rhel-server-extras rhui-REGION-rhel-server-optional

Is this really necessary? What does this do? Everything works without this step.

Sometimes if you don’t do this, you will not be able to get certbot or acme library on RHEL systems.
It’s completely necessary to do this when on EC2 or RHEL, but AWS might did it for you already (which is why you don’t need to do it)

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