That's correct. LLVM was started at UIUC, Apple later hired Lattner with the intention of making LLVM production-ready (in part as a replacement for the GNU toolchain), and ultimately to replace the GCC frontend by a custom / dedicated one.
The Clang project is part of the LLVM ecosystem, but is a major effort in its own right, so I think it is right to give credit where credit is due, in the same way e.g. the Rust compiler uses Rust as a backend, but credit for it doesn't to to the LLVM project.
The Clang project is part of the LLVM ecosystem, but is a major effort in its own right, so I think it is right to give credit where credit is due, in the same way e.g. the Rust compiler uses Rust as a backend, but credit for it doesn't to to the LLVM project.