Whilst their processes might be superior (although that's debatable), they very much aren't up to speed with GDPR https://www.bbc.co.uk/news/technology-46944696 (even if the fine is small fry to them and it's financially more attractive to flaunt the rules)
That's a completely different issue from their ability to respond to data requests like the one linked. I'd assume the incremental cost for Google to send you the data it has on you is close to zero.