The first step of the process doesn’t make sense, because the test can be solved perfectly by AI, and then only the people with the highest scores are invited to the interview. This means that someone who used AI to get 100% could block someone who actually has the skills.

Online test, then phone technical interview. Both require rather broad C++ knowledge like - describe compilation steps, describe basic types, what different cast types do, compare malloc vs new, smart pointers, lambdas, templates