In compiler context, "devirtualization" I encountered usually meant compiling a virtual call to a direct call. See for example "Devirtualization in LLVM and Clang" on LLVM blog: https://blog.llvm.org/2017/03/devirtualization-in-llvm-and-c... . "Devirtualization" in this post is something different, being an inverse of virtualization which is an obfuscation technique to hinder reverse engineering.
The phrasing of the headline really does suggest strongly that this is going to be an article about compiler optimization!