You are mistaken. Granted their deployment tools are still in an early stage, but like everything else in the guix ecosystem it looks promising

Here's a tutorial for guix server deployments https://guix.gnu.org/blog/2019/managing-servers-with-gnu-gui...

Here's the docs on guix deploy. https://guix.gnu.org/manual/devel/en/html_node/Invoking-guix...