Also, have you actually seen the auto-generated APIs he's referring to?
Here are the Godocs for the BigQuery API: https://godoc.org/google.golang.org/api/bigquery/v2
Here's some example code demonstrating the API's bad habits -- such as deeply nested struct pointers, and Do() methods everywhere: https://github.com/google/google-api-go-client/blob/master/e...
It's still labeled "experimental" though, which makes me a bit wary to use it just yet.
If you're OK with changing your code sometime in the future, then I'd recommend giving it a try for this or your next project. Changes will likely be minimal.
Use something like git-vendor: https://github.com/brettlangdon/git-vendor