The glue code is C++ still. It's also a much less glamorous job than when the C++ programmers were the "hot shit" instead of the people who specialized in accelerators.
So they are complaining that they can't find people who want to be second class citizens while still dealing with the pressure and hours using language skills they acknowledge are in high demand...
Yeah, kinda, CUDA is c++ that I can't run cppcheck or clang tidy on, and the important bits are either calls into the cu* libraries which are c style, or kernels, which are really their own thing.
Yes, kernel code is GPU style rather than CPU style.
But the CPU-drivers of CUDA are all C++. Albeit a C-like API (cudaMalloc, lol), but its a clang compiler for the CPU code nonetheless. If you have complex GPU + CPU interactions, you'll need to be a C++ expert.
Even if you aren't doing GPU work and sticking "only" with CPU-side CUDA, its all C++.