I was nervous about this too - but it's "just" the AUR. That means it's only unofficial packages, which we should always take great care when installing anyway.
Python venv's is the #1 reason I've avoided working with it more. It used to be #2 behind strong typing, but now that Linux OSes' take up the default python install and block it from being used for quick scripts, it jumped to #1.
I've always wondered why Linux OSes that rely on python scripts don't make their own default venv and instead clobber the user's default python environment...
For people who want an easier approach, both NethServer and Cloudron have this packaged as an app for people who self host. The Cloudron one is not official yet and is a community developed one.