Please note that the linked comparison table has been unmaintained for a while. This is even explicitly stated on the legacy musl libc website[0][0] (i.e., “The (mostly unmaintained) libc comparison is still available on etalabs.net.”).
This comparison was last updated around 2016-2017. Since then, glibc has improved its size efficiency (particularly with link-time optimization), musl has enhanced its POSIX compliance, and several performance optimizations have landed in both projects.
[0]: https://www.musl-libc.org