I think it's more like what you would use to build serverless.com a more fair comparison IMO would be to https://cloud.google.com/functions/

but it didn't use neither so ...

serverless is a config/deploy thing that deploys "functions" (to lambda etc.), ties them to HTTP routes or other events, provisions resources (storage etc.), ties them to your applicatoins etc.. The main thing it does not do is scaling etc. because you're deploying to a platform that handles that.