If you mean the table under "For comparison, space and time required to build each compiler", I think, that it is about what each compiler took in time and disk space to compile itself, on the same hardware, so it is about P compiling P sources.
V can not compile C or Go, Go can not compile C, and C compilers can not compile V or Go, so it can not be otherwise.
That is mainly because of how it is organized. tcc also compiles itself fast, because of how it works, and how it is organised.
That other compilers, like rustc, gcc or clang can not do it, because they have other priorities/tradeoffs, is their problem.