Good that it's working (kinda).
So it sounds like your DNS resolver is botched. Id dig into the doc on how systemd-resolverd should look and see if you can't rectify what went wrong (the arch wiki should have examples of what a default config looks like).
I don't remember if arch uses cloud init configs but it being reset at boot feels like a cloud init config problem.
Let us know the following
If ping works for: localhost, your gateway, 1.1.1.1, google.com.
The contents of your /etc/resolve.conf
If you have a tun0 interface (ifconfig or ip a)
You said you uninstalled tailscale. Are there any running process or active systemd units laying around?
But it's the fedRAMP version of grok, with all the required controls. Im just impressed he was able to get twitter fedRAMP certified this fast - must be a truly epic business man.
/s if you can't tell.
I've found there are two types of "leaders". One are the people you describe, the others are knowledgeable staff who somehow ended up in management at one point and realized they had to stay less the idiots take over.
One also calls themselves "thought leaders" while the other group is still working at 8pm.