No, users cannot delete their personal data, unless they have a Google account. Google collects an enormous amount of personal data from people without a Google account, and offers no tools for controlling that data.
In theory one would have to go to every website and request they report/purge data from analytics, but Google provides no mechanism for websites to comply with such a request.
As I see it Google has fallen into the false position that things they agree not to do based on user settings is the same as not collecting and storing the data necessary to do them. I don't think regulators will see this Google's way.
Some of this data collection can be turned off, though it appears not for all data categories across all Google services. Visitors are not offered a clear way to access, export, or even delete all personal data collected on them by Google.
The way several Google services are collecting personal data is in breach of GDPR.
Can you provide an example?