Arguably, they aren't even distributing the source code at all anymore. The GPL defines "source code" as "the preferred form of the work for making modifications to it".
I would be willing to bet any amount of money that no Google developer makes modifications using a tarball that's missing commit history. The preferred form for making modifications is a source control repository.
I would be willing to bet any amount of money that no Google developer makes modifications using a tarball that's missing commit history. The preferred form for making modifications is a source control repository.