I actually tried the fix on LOS thread.I tried to access the settings via dialer (and a 3rd party app, Network), *#*#3282#*#* but it is missing code and won't open. I'm unable to change any radio settings related to the LTE modem.
1. Fixing the carrier settings file has no impact. I tweaked a few other values too, no change.
2. I then tried installing LOS and lost all connectivity (like a bunch of people reported with verizon).
3. Tried the steps outlined in https://forum.xda-developers.com/t/official-lineageos-20-for-the-razer-phone-2.4514853/post-88018563
4. Eventually no amount of factory reset and flashing ever brought back connectivity. Only stock ROM would have connectivity.
I am now on MR6 (rooted) to ensure things work.