Ubuntu Focal 20.04 cannot install 10.4 series

I'm not sure where to post this, so, hopefully I'm not too far off here.

The webpage:
https://downloads.mariadb.org/mariadb/repositories/#distro=Ubuntu&distro_release=focal--ubuntu_focal&mirror=biznetgio&version=10.5

Doesn't offer the ability to install version 10.4 on Ubuntu 20.04/Focal. Not only that, there's no actual repos for Ubuntu 20.04/Focal with MariabDB 10.4, so manually adjusting the apt repo string doesn't work. Manually adjusting then doing 'apt update', results in:

The repository 'http://mirror.biznetgio.com/mariadb/repo/10.4/ubuntu focal Release' does not have a Release file.