Basically, the GDPR doesn’t guarantee your privacy at all. Instead, it hands it over to the state through its court system.
Add to that the fact that the EU’s heavy influence on the courts is a well-documented, ongoing deal, and the GDPR comes off as a surveillance law dressed up to seem the total opposite.
Quite right it doesnt absolutely protect your privacy. I'd agree that it's full of holes, but I do think it also contains effective provisions which assist with users controlling their data and data which identifies them.
Which courts are influenced by the EU? I don't think it's true of US courts, and courts in EU nations are supposed to be influenced by it, it's in the EU treaties.