That's a good point! Domain owners can host their websites wherever they like, and yes that includes Google's cloud.
If they go through a content network like Cloudflare, you can't even tell who's hosting the site by looking at the IP address.
It drives home the point that websites are abstractions that have no necessary relationship to any particular physical hardware. Network tools may or may not tell you a bit more about the source, depending on if there are any leaks in the abstraction.
There is a difference between the web publisher controlling that abstraction and a web publisher that has been strong armed into one abstraction or another.
If they go through a content network like Cloudflare, you can't even tell who's hosting the site by looking at the IP address.
It drives home the point that websites are abstractions that have no necessary relationship to any particular physical hardware. Network tools may or may not tell you a bit more about the source, depending on if there are any leaks in the abstraction.