[vocx2tx]

He probably ran ls on /usr/local/go (it's 477MB on my machine). But that's the size of the entire Go download after unarchiving, which includes the runtime's and all the standard library's 1) source code and 2) precompiled object files, both in normal and race-mode.

So no, that's not the actual size of "the Go runtime" for any meaningful definition of "the Go runtime".