You would be surprised. Google uses "g4" (e.g. "p4"-like), much like many game developers like me. It's not like we don't use "git" (we have devops/infra groups) - but lots of folks use Perforce/PlasticSCM/other systems that are not "git".
Just because "git" is super-popular, does not mean that ANY PROFESSIONAL DEVELOPER SHOULD BE FAMILIAR with it... Sorry but no!
Just because "git" is super-popular, does not mean that ANY PROFESSIONAL DEVELOPER SHOULD BE FAMILIAR with it... Sorry but no!