It's Starlark, the language for configuring the build system Bazel. Bazel is the open source port of Google's internal build system, Blaze. Starlark is a subset of Python.

This list of corporate project name associations makes me wonder where Galactus comes in. :P

https://www.youtube.com/watch?v=y8OnoxKotPQ

if I had to guess, that is a typo and should be starlark, which is the language used for bazel build files. bazel is the build system they use

Github says "Starlark 6.2%", so it looks like whitten's typo, not GitHub's.

on any layout operated by a human, who may at times type the wrong word entirely

…and/or fall victim to autocorrect.