The people who are senior-level in the games industry right now today usually have some experience at the assembly level. Even if they are not that great at reading it, they can open a disassembly window and understand what they are seeing. Or if they are working on topics like graphics, they can instead interpret what amounts to the shader's assembly language and the graphics instruction stream.
Compiler writers, too, need to be comfortable at the assembly level and understand the microarchitecture within the CPU.
For these professionals, C is quite high level.