Not sure about you, but for me it was felt like a 20% project that someone on the Android team does something when they happen to be free of work.
If it wasn't for JetBrains coming up with CLion we still wouldn't have a replacement for Eclipse CDT, multiple reboots of NDK build tools, no real story on how to share libraries between NDK projects, native APIs are C wrappers to C++ code that we wrap again in C++ for proper type safety, permissions or file access require JNI, no AndroidX/JetPack like libraries and the list goes on.
The IO talk was more of state of nation than anything else.
Apple and Microsoft platforms are definitly more C++ developer friendly regarding the overall tooling, and mixed language development support as well.
But I did notice in the linked article that they are only targeting x86_64, so I don't think this libc is targeted at Android.