Just out of curiosity, has there been any change in macOS 10.15.1 that would explain connectivity issues appearing when a NKE which has been working fine for the last 7 years from OS X 10.7 to macOS 10.15 is installed?
The official release notes are detailing anything in this area (or in any area actually).
The Security Update release notes are reporting as usually changes to the Kernel to address some security issues but, last time I checked, this NKE was not relying on security holes in the OS.