What is the issue with the Compatibility Standard?

3.4.5. Keyword mappings states that "These definitions of -webkit-box-* are known to not be web compatible", but that section does not contain any webkit-box-* definitions.
It has -webkit-box with nothing after it, and -webkit-flex, -webkit-inline-box and -webkit-inline-flex.

I assume that this is just a copy paste mistake from the warning in the previous section, but I thought I'd open this issue so someone who actually knows what's going on can double-check that.