Update.
After an arma 3 tools update. everything is working again.

Reinstalling Visual Studio redistributable hasn't fixed the issue for me.
Uninstalled, rebooted computer, installed, rebooted again. Reinstalled Arma tools. still no change to the issue.

I think an in-game gamma adjustment setting needs to be added. Or at least a calibration screen of some sort.
With the previous versions of Reforger, for me, nights got too dark, so I adjusted my computer monitor so in the darkest of nights I could just barely see. Just on the threshold to be able to see infront of me and not be stuck trying to navigate with a literal black screen.

Possible related/same issue:
https://feedback.bistudio.com/T176461