“There are a few important limitations of the jailbreak, though, that keep this from being a full-blown security crisis. The first is that an attacker would need physical access to target devices in order to exploit them.”
“The tool can only run off of another device over USB. This means hackers can’t remotely mass-infect every Mac that has a T2 chip.”
“In this case, you’d likely have to be a very high-value target to register any real alarm.”
It has nothing to do with internet security, and unless you’re a high value target, I can’t see anyone going to the trouble of stealing your machine, and doing a rather complicated exploit.
I think you can relax