That’s not really my area of expertise but you learn more in the automount man page and other pages linked to from that. Why do you care? My general advice is that you ignore volumes that you’re not interested in.
Next time when something isn't your area of expertise, do everyone a favor and just don't say anything..
You can look into this more by running:
cat /etc/auto_master
cat /etc/auto_home
And if you really want to unmount:
/System/Volumes/Data/home
Comment out all lines in /etc/auto_home and /etc/auto_master (I believe you will need to use sudo eg. sudo vim /etc/auto-master and then make edits OR you can always just delete the files if you absolutely don't use network mounts etc.)
sudo automount -vc
Topic:
App & System Services
SubTopic:
Core OS
Tags: