The NLRB is one of many independent agencies of the executive branch created by Congrees, and they don't report to anyone except for their own boards. The president and Congress have influence over the boards but no direct control over the agency. The idea that the president can just ignore these laws because of a "unitary executive" theory is authoritarian bullshit.

And the concern probably isn't Russian hackers, it's American hackers spoofing their IP address. Also you are ignoring that DOGE made the server public when it wasn't supposed to be.