I am pretty sure Amazon Linux 2023 does not support snapd. Or at least not officially.
Canonical does not show it in the list of their supported platforms for snap. I installed an unofficial one as far back as Amazon Linux 1 (or maybe 2 I forget) but it was painful.
I think the pip/venv is probably the best if you insist on Certbot on AL2023 but you can find those instructions on Certbot site too. In fact, that Medium blog copies the Certbot docs for alternate methods. The pip install is here: