Yes, indeed! 
What I didn’t know: it mounts the thing on demand! After boot I checked df -h and the output of mount, but my nfs share didn’t show up. Only after e.g. ls /mnt/oracle/ it gets mounted in the background. (I guess any comment on that design idea goes into the systemd holy wars, which is not the topic here 
)
So, you’re right. The following line in my /etc/fstab does work as designed:
deusex:/mnt/oracle /mnt/oracle nfs ro,x-systemd.automount,noauto 0 0
Thanks!