Hello there!
How can I permanently disable the appropriate systemd unit pinging duh ping . manjaro . org 
With every manjaro- system global its getting configured again… not that I got a problem with that, it’s just
a firewall keeps ■■■■■■■■ about it in our “enterprise” lan
Would it suffice to attr +i it with a empty systemd unit file to shut it up?
Thanks in advance,
P.
Reading the link @Tomek gave above, you could try to create the below file with content as shown 
[connectivity]
enabled=false
You could even keep it enabled but change the uri used, using same logic in filename and content as shown in the link above…
I remember there is also a systemd-networkd specific service for connection checking similar to that of NetworkManager, but i forgot at moment, it should be listed on the internet somewhere…
Sounds like maybe you were just editing the system file, which then gets replaced on update.
So follow the steps above to create your own file that wont be overwritten.
there are instructions there on how to disable it.
An empty file would be sufficient to disable NetworkManager’s check.
sudo touch /etc/NetworkManager/conf.d/20-connectivity.conf