The ubuntu graphics driver team is responsible for packaging, so it’s pointless to ask nvidia about it.
Besides, I’ve taken a look at what’s provided by the package and the 32bit compat libs are still provided with the 16.04 430 ppa package. Since 16.04 is still a non-glvnd system, it uses the alternatives system to switch GL implementation. Maybe on your system it’s incompletely switched, see:
https://forums.developer.nvidia.com/t/opengl-nvidia-and-ubuntu-14-04-issues/52875/6?u=generix
The compat libs should be in /usr/lib32/nvidia-430/
In general, 16.04 is a dead end, the Ubuntu graphics drivers team doesn’t release any new drivers for it.
Rather upgrade to a current Ubuntu version to get full glvnd, latest drivers (440) and toys like PRIME render offload.